I have to say, out of all the KZitem videos I've ever watched, you are the absolute best teacher I've ever seen
@UncleDoug
7 жыл бұрын
Wow, thanks so much :)
@fieldofweeds
2 жыл бұрын
I really like these videos too. It’s wonderful to finally understand how these things work-and my dad used to build ham radios from scratch..
@JeremiahL
5 ай бұрын
Im a mechanical engineer. I took E-science in college,.. I got a B in the class, but it was just an endurance test, and I kind of put all of the math in a compressed ball of knowledge that I would discard as soon as the situation allowed... Fast forward 25 years... My hobbies have once again drug me into deep waters.... I dont know why, but I have to understand how all of this works,... Needless to say, but this explanation is so practical and consumable that I just can't stop watching these videos.... I wish there was a way to assign a value to people that were willing and able to spend the effort to present an otherwise difficult to understand topic in practical terms. Its as if someone handed me an exaplaination free of charge, and thanked me for accepting,,, Im very greatfull....
@UncleDoug
5 ай бұрын
We appreciate your very kind comments, Jeremiah, and are glad that our videos have been helpful :)
@johndogwater
8 жыл бұрын
These are FANTASTIC! Everyone should watch these, and Rusty is just the icing on the cake. Dogs just move anything onto the next level. Thanks for making these, you are providing a valuable public service.
@UncleDoug
8 жыл бұрын
+johndogwater You're welcome, John.....glad you enjoy the videos :)
@epicrapton
9 жыл бұрын
thank you, Uncle. I wish I had this kind of teacher in the university 10 yrs ago.
@UncleDoug
9 жыл бұрын
Epic Crapton You're welcome, Epic (Rusty loves your screen name). We're glad the video was helpful :)
@davey4697
4 жыл бұрын
Great name Epic!
@bobbarcus8310
9 жыл бұрын
Your the best thanks so much for your time to teach us
@UncleDoug
9 жыл бұрын
Bob Barcus Thanks so much, Bob :)
@zackakai5173
2 жыл бұрын
There's a surprising lack of material on the internet going in depth about how amp/pedal circuitry works on an electronics level. These are by far the best videos on the subject I've found. EDIT: Oh and also there are dogs, which makes literally anything better.
@UncleDoug
2 жыл бұрын
Thanks so much, Zack. Glad you enjoy our vids....and pets.
@Zemiltube
Жыл бұрын
The best explanation I've seen of what a capacitor does to audio 11:35 and how it works as a filter. So clear at last!!! Thanks you're an awesome teacher and communicator. 👏👏👏
@UncleDoug
Жыл бұрын
Thanks, Z. Glad it was helpful.
@atconditions
6 жыл бұрын
thanks for leaving out the maths and the formulas to make it able to get a basic understanding to begin with.
@UncleDoug
6 жыл бұрын
You're welcome, AT.
@jenniferwhitewolf3784
7 жыл бұрын
Excellent... as an analog EE, it sure is refreshing to see educational material as well done as this. I will be referring people to this series rather than spend time teaching myself... Well done!
@UncleDoug
7 жыл бұрын
Thanks, JW :)
@farfisa5
8 жыл бұрын
Thank you for all of your dedicated work. I'm a visual learner so reading is very difficult, which makes vacuum tubes a very difficult hobby to understand. Capacitors have *always* been difficult for me to understand for some reason (for the past four years I've been in the EE hobby) and you have been able to explain it to me perfectly. You explain *why* exactly how I need it.
@UncleDoug
8 жыл бұрын
You're welcome, Bob. Rusty and I are really glad that our videos are helpful to you. Thanks for watching :)
@chrisbraddock3831
2 жыл бұрын
Your videos are the BEST explanation of this stuff I have ever found. You make complex subjects so much easier to understand and apply. Thanks for making these!!
@UncleDoug
2 жыл бұрын
You're welcome, Chris. Glad you enjoy them.
@lylejohnson7591
4 жыл бұрын
I am 72 and it has been a long time since I was in electronics so this is back to school for me.
@tonyleach5614
10 жыл бұрын
Another great video... I was fiddling around with my amp in my garage looking at the tone stack of my Fender Blues Deluxe amp and my phone alerts me you uploaded a new video about tone stacks! Unreal. Also your cat looks exactly like my cat only mine is a boy and boy is he finicky. I love your videos so keep 'em coming! I'm learning a lot!
@UncleDoug
10 жыл бұрын
Thanks for the great comments, Tony. I'm glad you enjoyed the video, and relieved to know that I'm not the only owner of a finicky, spoiled kitty :)
@dtrude000
3 жыл бұрын
Thank you , for all of your knowledge, patience, skill,and humor you and the gang put into all of your content. Just found you through Colleen Fazio . You have inspired me to get into repairs and builds. The Schematic hac been un locked by how you explained . No longer confused. Thank you sir.
@UncleDoug
3 жыл бұрын
You're welcome, Daniel. Best of luck with your new career :)
@justinc3959
7 ай бұрын
Fabulous videos, thank you and Rusty for all the hard work! Towards the end of the video you declined to go down the rabbit hole of the full purpose of the resistors and interaction between the capacitors and resistors as beyond the scope of the video - please consider doing another video on that subject, it was the part I was particularly hoping to learn more about! Thanks again : )
@UncleDoug
7 ай бұрын
Thanks so much, Justin. Please look at the Valve Wizard site to see his explanation of the LTP phase inversion circuit.
@charlesgwyn2115
10 жыл бұрын
Can hardly wait for part 2! I'm working on a tone stack project right now, so this is timely and appreciated info.
@UncleDoug
10 жыл бұрын
I'll try to get part 2 out in the next few days, Charles. Every time I think it's ready, I remember some additional points that need to be included. Also, I will introduce you to a program that will make your project much easier. See you soon :) ^. .^
@michaelszczys8316
5 жыл бұрын
So far so good uncle Doug. We’re gettin it. At least most of it. I’m a mechanical wizard and pretty good with electricity but when it comes to radio and amplifier type circuitry that’s where I start slamming into the wall. I’m good with regular resistance, good with transformers and some inductance but capacitors were the cliff to drive over. They’re coming around more and more. That last part of this one with the ‘ why is there a resistor in the circuit ?’ even made sense to me before you even asked that. I just knew they probably worked together somehow, couldn’t explain it, just knew they balance out together somehow
@UncleDoug
5 жыл бұрын
It sounds like you're making progress, Michael. Keep up the good work.
@SquidPartyGames
10 жыл бұрын
I very much enjoy how very well made these videos are. A real air of professionalism.
@UncleDoug
10 жыл бұрын
Thanks so much, Daniel. Rusty and I kid around a little sometimes, but we really try to make the videos clear, concise, and informative. It's good to know that viewers (like you) are enjoying them.
@AdamRainStopper
10 жыл бұрын
Uncle Doug Viewers like me are enjoying them too! I didn't really UNDERSTAND just how similar (equal and opposite) a low-pass filter was to a high-pass filter until I saw you drawing it out and narrating in plain English. THANK YOU!
@UncleDoug
10 жыл бұрын
You're quite welcome, Adam. Yes, the two filters are really quite similar in design but opposite in function......which is an unusual combination. It's always good to hear from you. Please stay tuned for part 2, I think you will like it :)
@AdamRainStopper
10 жыл бұрын
Uncle Doug I will be anxiously awaiting part 2. I need to understand the theory of the cathode-follower better, because I know I can do a much more effective tone control if most of the preamp stages are left alone to drive each other into clipping, then a late-stage cathode-follower takes the ALREADY DISTORTED signal and sculpts it into a mor mixable tone. This is why so many people prefer to have an eq pedal in the effects loop of a relatively high-gain amp, rather than just try to shape the tone early in the signal path, but I don't want to have to complicate a build with adding a separate path for an effects loop. Can't wait to see you and Rusty for round 2!
@UncleDoug
10 жыл бұрын
An interesting concept, Adam. Please let me know how it turns out. If you are still uncertain about cathode follower theory, then do some Internet searches on the topic and (my favorite) download a schematic that features a CF and study each of its inputs, outputs, voltages, etc. Using this, you can then create a CF within another non-CF circuit. Best of luck !!
@alvagoldbook2
10 жыл бұрын
For me, tone stacks have been one of the most interesting things about tube amps, and has been a big focus of my study. I've been waiting for a well-thought out and elementary explanation like this one. Another great instructional video, Uncle D! Well done!
@UncleDoug
10 жыл бұрын
Thanks so much, Alva. It is an extremely complex issue, due to the countless tone control variations found in guitar amps. Let's face it, this is the one area where an amp manufacturer can impose some originality on otherwise fairly consistent circuitry. I can't come close to covering all the details, but I will try to provide sufficient detail in Part 2 to give a clear overview of the topic and a good comparison of 4 different (and common) stacks.....so stay tuned :)
@carlbottcher2177
7 жыл бұрын
Thanks for the effort you put into these videos. I studied vacuum tubes (Valves we call them here in SA.) in college in 1996 doing my Naval radio course. This has been an excellent refresher.
@UncleDoug
7 жыл бұрын
You're welcome, Carl. We're glad the videos are helpful :)
@davey4697
4 жыл бұрын
Thanks Doug for all of your efforts, you are like the teacher I always wanted. I love your videos. So informative and easy to understand. I could make valve amps all day long.
@UncleDoug
4 жыл бұрын
Wow, thanks so much, Davey. We really appreciate it :)
@stevehurd6708
4 жыл бұрын
I love Rusty's enthusiasm! I just found your channel. Love the content!
@UncleDoug
4 жыл бұрын
Yes, he did tend to be hyperactive at times ;) Welcome :)
@FIGSANE
4 жыл бұрын
I had a big OH moment went you were explaining frequencies lol "How frequently the signal alternates." XD
@Analoque444
4 жыл бұрын
Thank you very much for absolute all your videos and all your efforts. This is a great channel and I want to send greetings to you and all out there, who watch your channel. Best regards
@UncleDoug
4 жыл бұрын
Thanks so much, 4N4 :)
@codebeat4192
6 жыл бұрын
Very useful stuff here, very clear explanation and your funny too with your dog, thumbs up.
@nachom1971
4 жыл бұрын
You are the uncle I always wanted to have. Thanks Uncle Doug!
@UncleDoug
4 жыл бұрын
Thanks, Nacho.....and you are nicknamed after one of my favorite snacks (plus a pitcher of ice cold beer, of course) ;)
@nachom1971
4 жыл бұрын
😂 One of my favorite too although people call me a cannibal when I eat them. Nacho is short for Ignacio. Anyways, I am counting on hopefully one of my nephews growing up to love electronics and inherit my guitars, synths, tube amps and love for cars, machines and pets just like you. I'll become their Uncle Doug and I'll show them your videos. BTW I earned an aerospace engineering degree from college and although we had a strong electronics background, not one of my teachers was nearly as good as you. It is very sad because electronics always intrigued me since I was a child tearing TVs and radios open but they sure made me feel intimidated by it. There was simply no practicality behind all the physical concepts and math behind it. I earned really good grades in all other classes, even got a minor in math on the side but it was that darned electronics 2 class that had me drop half way through having to repeat it and leaving an big mole on my otherwise good record!
@RC-Flight
6 жыл бұрын
You have an amazing way of explaining electronic circuitry that makes It so easy to understand. Thank you so much for taking the time to produce these in-depth videos. I find them riveting and much more interesting then even the people of Walmart videos!
@UncleDoug
6 жыл бұрын
Thanks, Glen.....I guess. But now that you mention it, it does take a really good instructional video to outdo the horrors of Walmart :)
@AlexanderShibilski
9 жыл бұрын
I've always preferred the plate driven tone stacks. I tend to like a lot of sculpting capabilities
@stephenchow5161
6 жыл бұрын
thanks for these videos. make it so much easier to read other books which get bogged down in technical details and losing site of the big overall picture and concepsts
@UncleDoug
6 жыл бұрын
You're welcome, Stephen :)
@frankymcdonald3081
10 жыл бұрын
Good to see you again. i appreciate the knowledge. Rusty must have a hard time doing camera work with that sweet ride in the garage always beckoning to go see what the girls in the neighborhood are up to.
@UncleDoug
10 жыл бұрын
Likewise, Franky. I've tried to get Rusty to ride "shotgun", but the shoulder harness doesn't fit him very well and it's hard for him to chew his bone while sitting up :)) ^. .^
@nelsondejesus2796
9 жыл бұрын
Hey Uncle Doug, Thanks for the great theorizing of the circuits components and their basic variables. I saw alot of what the great designers like Leo Fender,JimMarshall, Tom Jennings,Dallas Reeves, to name a few including the bolstering of the latter Randall Smith of Mesa to the Soldanos had in mind and the overall designs of passive to active. I use a downloaeded Tonestack Calculator and it makes it easier using your input to achieve a great deal of information I either didn't have or didn't understand.!! I've seen you explain many of their concepts in depth! It's more than just adding or changing a resistor, or capacitor here and there, but I didn't lose interest and best I could at least rewind and start again!!! I have an incredible amount(s) of bookmarks and have applied alot to my own works,..I noticed this last forum also relates to the basic use of the .001uf for the ''Treble Bleed'' on my guitar's Volume pot and Tone control. After awhile it all seems to make sense, please keep up the great works!!
@UncleDoug
9 жыл бұрын
You're welcome, Nelson. It's always good to hear from you. Rusty and I will do our best to keep up the video production.....as long as you promise to keep watching :)
@justinblee
10 жыл бұрын
Wonderful video and great instructional design. I loved it!
@UncleDoug
10 жыл бұрын
Thanks so much, Justin. Rusty and I are glad you enjoyed the video :)
@kevinking2468
10 жыл бұрын
Uncle Doug - Thanks again for the superior instruction!!!
@UncleDoug
10 жыл бұрын
You're quite welcome, Kevin, and thanks for the kind appraisal :)
@JesusIsLordofMybeing
7 жыл бұрын
Thanks again Uncle Doug!!! You are truly an amazing instructor!!! Funny with your pets as well!!! Thanks again!!
@UncleDoug
7 жыл бұрын
You're welcome, Jt :)
@deemac7551
Жыл бұрын
Such a great help. Great, great electronic teaching.
@UncleDoug
Жыл бұрын
Thanks, Dee :)
@68MalKontent
10 жыл бұрын
Very nice video, the tale of the judgemental capacitor is just sweet :) You wrote somewhere, that Rusty does all the script writing, so no wonder he's not interested in mere camera work, having written such a masterpiece ;)
@UncleDoug
10 жыл бұрын
Thanks so much, Stan. Yes, Rusty vacillates between cinematography, script writing (and editing), and mastering the Lydian Scale on his '59 Les Paul.....he's a very talented and versatile hound :) ^. .^
@garyadkisson4790
10 жыл бұрын
Thank you so much! I am fairly new to the tube amplifier circle and have read and studied for a while now, but you have given me more understandable knowledge in your videos then I have found in any book! By the way I started working on amps because the pole dancing gig wasn't going anywhere.... Again thank you. Can't wait for the next one
@UncleDoug
10 жыл бұрын
Hi, Gary. We have mixed emotions about your comments. On one hand, Rusty and I are quite flattered (and happy to hear) that our videos are clear and helpful.....but we are also saddened to learn that your pole dancing career failed to materialize. I'll speak with Anastasia when she brings over her Fender Tweed Deluxe for a "tube biasing", and see if she has any suggestions. Meanwhile, thanks for the nice comments and best of luck with your interim career in tube amps !! :) ^. .^
@huberttremaine8343
10 жыл бұрын
Another brilliant video! I hope I'm not too late for #2' and request Baxandal tone controls like what Ampeg uses. If not maybe sometime in the future. I'm sure it takes a lot of time and effort to make these videos and you sharing your vast knowledge, is giving guys like me the courage to repair, design and build our own tube amps. Thanks!
@UncleDoug
10 жыл бұрын
Thanks so much, Hubert. I have not finished Part 2 yet and will include the spectrum of the James-Baxandall passive tone stack. It should be noted that the Baxandall tone circuit yields flat response which is generally better suited to HiFi and Stereo amplification than to guitar amplifiers (for reasons that will be discussed in the video). Thanks for the great input !!
@spaceblues5972
3 жыл бұрын
This is so helpful, I'm glad i found this video
@UncleDoug
3 жыл бұрын
So are we, SB. Welcome aboard.
@tubical71
10 жыл бұрын
Hi Doug, as usual you have just done a *great* job :) As for 10:00 and up, you may check the whole thing from the manufacture´s point of view: 1) tubes are expencive, so why we need another one, in this case a tube witch does not amplify? Because the 12AY7 here is cheaper than the pots you will need when the 12AY7 is not in there....The pots you´ll need without the 12AY7 would be 10x higher, you´ll need to have 10meg inside. They are hard to get, and not cheap. Today they are no longer made anyway. The only high impedance pots are the 1meg types.... 2) if you put 10meg pots in, just because you can, will result in a very noisy Amp, because 10meg just picks up *any* noise around. Very good sheelding would be needed. And if you gonna touch the knob of the pot the whole amp would produce hum immediately. Thanx for this one, Doug!! :) Can´t wait to see Part Two!
@UncleDoug
10 жыл бұрын
Greetings, TC. I enjoy reading your comments because they always add some interesting info and details to the discussion. You make a good point about the financial benefits of a cathode follower vs three (more) expensive pots. I think we often fail to understand that many of the decisions made regarding amplifier circuit design are based on increasing (or maintaining) the profit margin, rather than simply optimizing the tone or function of the amp. Amp building was, after all, a business rather than a humanitarian endeavor :) Thanks for your kind words and knowledgeable input.
@tubical71
10 жыл бұрын
Uncle Doug Amp building is in *first place* a business, sorry to tear of some sparkles from the companies, but in fact they just stole some ideas from each other. Fender did that from the earlier gibson amps, while marshall just copies from fender (bassman). In fact the first marshall amp was a bassman clone. Furthermore (if you put faith in these companies - please do not read on) They don´t know how to build amps. As if they would, they simply would/will build them completely different. (besides that; the schematics are ok - to point that out!) I was in some of them. And the way they ground the components just put tears in my eyes. If only they ground the components like a good audio designer would do it, the Amps would be a *lot* more quiet (no hum and *no* noise) And when i say a lot i really mean it. -90dB total SNR would be easily achieved just with good and *propper* grounding. *One* ground terminal, where to put *all* ground pins and *one different* point of the chassis where there is *one* wire going to is propper grounding. This is rule number one for serious audio design... Isolation of all terminals,pots and jacks from chassis, or if not possible ground them with *one* and very *fat* wire together and put this on main ground. That is rule number two....and there are much much more of these to follow ;) But i have to say this, i like Instrumental Amps very much anyway. Even my very noisy Laney "Super PA"
@GregsGarage
10 жыл бұрын
TubiCal I love reading the discussions you two have. Just adds another layer of frosting to this cake. Thanks.
@UncleDoug
10 жыл бұрын
I don't blame you, Greg. TC is extremely knowledgeable and helpful. His comments are always worth reading and generally add an extra dimension to the video.
@tubical71
10 жыл бұрын
Many thanx for the flowers Doug and Greg. Audio electronics are my passion since i got my first tube Amp when i was around 12 years old. I found it in the streets, where we used to have a sort of bulk garbage. All big unwanted stuff that doesn´t fit in your garbage bin could be placed in front of your property once a month and have been picked up by local litter service. That good old days it was easy to find tube based gear, as old TVs/Radios/HiFi and Tube based record players. These ones i liked the most, since it was very easy to pull out the Amp chassis and play around with it. Nowadays this is not possible anymore due to some strangers who just to snoop around and spread everything around the streets. So everything has changed. We have some disposal companies where one can put every electronic stuff and they do not give anything away...
@brianpotter7520
10 жыл бұрын
"THANK YOU" so much for your videos, I have wanted to get into how amps work for along time, your videos have helped me learn so much, I have a lot to learn still, but I feel like Im finally on the right track. you just can't go out and have someone teach you how to build your own amp. Rusty is the coolest too
@UncleDoug
10 жыл бұрын
You're quite welcome, Brian. Rusty and I both appreciate your interest and input. We hope the videos are helpful and that life treats you right :) Best of luck !!
@kimarbella
8 жыл бұрын
Thank you so much!! You're this moms' favorite professor. I subscribed and shared
@UncleDoug
8 жыл бұрын
+Kim Orellana You're welcome, Kim. We really appreciate it :)
@joshuarego5161
6 жыл бұрын
You are an amazing teacher thank you for sharing your time and knowledge.
@UncleDoug
6 жыл бұрын
You're welcome, Josh :)
@EddieLeeFunn
4 жыл бұрын
Rusty, at about the 1:30 mark: "Yeah, no... not feelin' it today, Doug!"
@UncleDoug
4 жыл бұрын
That pretty well described Rusty at any and all times ;)
@greg4272
2 жыл бұрын
I'm sure the cat has a high pass brain-capacitor in her head, that filters out all non-food-related sound frequencies from your voice! I could see it working in her eyes!
@UncleDoug
2 жыл бұрын
That, and back-scratching frequencies ;)
@rolyart3
4 ай бұрын
Wait…there’s a “Russian pole dancing video”?! Thank you so much for videos like this one! I have referenced your videos so many times. They really have enhanced my love of tube amplifiers.
@UncleDoug
4 ай бұрын
Yes, indeed, Roly.......and they are a sight to behold. We're glad you enjoy our videos :)
@eph_kni
8 жыл бұрын
Thanks Uncle Doug! always appreciate you putting in the time for these videos. I was hoping you could share your 30 minute video (if you have one) explaining the "subtle nuances" of resistor to capacitor relationships. Now I still haven't watched part2 of this series, but perhaps there is still more to learn. Regardless, thanks for helping make learning electronics fun!
@UncleDoug
8 жыл бұрын
+Joe Knight You're welcome, Joe. I really tried to do exactly that in this video series. The function of high and low pass filters is based on the selection of component values and their interaction, as predicted by the cutoff equation presented in Part 2. Hopefully, your curiosity will be satisfied after watching both parts.
@eph_kni
8 жыл бұрын
It was and thank you. I was just too excited to find out haha!
@UncleDoug
8 жыл бұрын
You're welcome, Joe....glad you liked it :)
@marvinkentvillamor1570
3 жыл бұрын
thank you very much for this Uncle Doug.
@UncleDoug
3 жыл бұрын
You are very welcome, Marvin.
@TrackingWidgets
4 жыл бұрын
First off, thank you so much for all of your videos, they are incredibly informative, cover the material in an easy to understand language, and are entertaining as well - you have a wonderfully understated sense of humour!! On the topic of tone stacks, at the point where you introduce the more standard appearance of a high and low pass filter in a circuit, I'm not grasping the effect of the resistor in its two positions. My level of understanding only goes so far as to know that this combination results in a certain output frequency response based on the values of each, but how the resistor affects the outcome is unclear. Is there a way to look at what the resistor does that is visually similar to understand as your explanation of the capacitor in the circuit? The information allows me to look at more parts of a preamp or amplifier circuit and understand the affects of all of the components, such a great thing to understand when wanting to modify a circuit!! Cheers and stay well!!
@TrackingWidgets
4 жыл бұрын
Well, ain't that quick!!! I was just a couple of minutes into the section when I typed the question above, am finding my answer at around the 22 minute mark!! As was the statement in a popular skit on SNL, "never mind" ;-)
@UncleDoug
4 жыл бұрын
I'm glad the answer was provided in the video, TW. Thanks for watching and subscribing.
@LowEndStrings
10 жыл бұрын
That's how i love to learn something. You're such an amazing teacher for amp stuff. Even I understand it :D By the way, i'm really looking forward to part 2 of this series. I have some problems calculating the cutoff frequencies for the tone control. I know the formula, but there is a misunderstanding about the signal flow. (if it's a low pass or a high pass in this case) :) But yeah, great as always. I'm watching your videos almost every night :D
@UncleDoug
10 жыл бұрын
Thanks, LES. It's good to hear that you are watching and enjoying the videos. I made several videos on a different channel before I started my own. They cover an electromechanical tremolo, a Fender 6G15 Reverb clone, and a National 70 Bass amp. The videos are on the ElPaso TubeAmps channel. I will discuss the calculation of the cutoff frequency in Part 2. I believe the formula is the same for both high pass and low pass filters, but the graphs are opposite (the same as they appear in Part 1).
@jeffb6161
8 жыл бұрын
thanks for a great explanation, of a very complex situation. wow back to the drawing board!!
@UncleDoug
8 жыл бұрын
+jeff b You're welcome, Jeff. I don't grasp all the complexities either, but the Tone Stack Calculator in Part 2 is an invaluable resource that saves a lot of time when designing a tone stack.
@jeffb6161
8 жыл бұрын
thanks, I will be sure to watch part 2 as soon as possible, was thinking of adding tone control to the HiFi I have been building.
@UncleDoug
8 жыл бұрын
You're welcome, Jeff. HiFi tone controls are often active, rather than passive, so you might want to do some research in both types of control methods.
@jeffb6161
8 жыл бұрын
ok, will look into active and passive. Need to get back to the amp soon, has been sitting at the back of the bench, gave up on it for awhile trying to learn more. Only problem I have now is hum at zero volume. Should I have source or music ground connected to the volume pots? Think the hum is the preamps gaining ground at zero volume. When I turn up the volume pots the hum goes away. Thank you Doug, say hello to rusty!! And jack
@UncleDoug
8 жыл бұрын
You're welcome, Jeff. That's a strange problem. I've heard of hum that either obeyed or ignored the volume control, but not hum that was inversely related to the volume setting. I'm not familiar with the concept, but perhaps your theory is correct and at zero volume, the ground (chassis, I assume) is acting like an antenna (?) Since I assume that your chassis (ground) is, itself, grounded via the wall receptacle, you would think that any signal generated in the chassis would go to the earth ground. Very mysterious.
@NotMarkKnopfler
8 жыл бұрын
Doug, I can't thank you enough for these videos. They are just fantastic. Perfect. You've got me wondering if I can re-purpose the frankly rather useless tone controls on a Fender stratocaster and have one as a treble control and one as a bass control.
@UncleDoug
8 жыл бұрын
+NotMarkKnopfler You're welcome, Not Mark, and thanks for the nice comments :) Anything is possible.....I suggest that you read up on the subject and then experiment with different components and values to see if you can come up with separate tone controls. Good luck.
@denniswalsh8476
8 жыл бұрын
You might want to try the OEM Fender "Tone-X" kit in one hole, for under $15. If it works for you, buy another one. Lots of drawings on the web. Standard Strat tone controls, (while wonderful and 62 years old), got a bit goofy when the 5 position switch replaced the 3 position. Pickup selector in position 2 now has BOTH tone controls in service. A slightly more difficult mod is... convert the whole Strat to use only one tone, (including the bridge). Add a simple switch in the second hole and use that to connect the neck to the bridge PU together, like a Tele. When switched "on", this will work to play the neck and bridge together with the PU selector in position 1 or 5. All three PUs play together in Position 2 or 4. There are $5-$10 CDs on e-Bay with "1001 ways to wire your guitar".
@UncleDoug
8 жыл бұрын
Thanks for helping, Dennis :)
@smehtarocks
9 жыл бұрын
A very informative video! I'm trying to build my own guitar amp and this video helped me a lot! subed :)
@UncleDoug
9 жыл бұрын
smehtarocks Welcome aboard. Glad you enjoyed the video......thanks for subscribing :)
@charleslambiase5670
4 жыл бұрын
What an education now I understand more of why I love the system
@UncleDoug
4 жыл бұрын
I'm glad the video was helpful, Charles.
@FreddysFrets
9 жыл бұрын
Hi Uncle Doug, So many light bulbs went off in my head watrching this video. I've been tinkering with tube amps for a while but there where areas that I did not really understand that well. The way you explain things is brilliant....for the first time I really get it.WOW! Thank you very kindly sir! Subscribed.
@UncleDoug
9 жыл бұрын
FreddysFrets You're quite welcome, Fred, and welcome aboard the UD & Rusty Channel. Thanks for watching and subscribing :)
@jakebikelands9616
3 жыл бұрын
Thanks Uncle Doug for the great information! When you were describing how cathode followers worked, you mentioned that the cathode provides a low impedance, high current output. I was thinking then, why don't they design amps whereby the cathode follower is the final output tube so it would be able to drive the speaker directly and thus eliminate the costly output transformer?
@UncleDoug
3 жыл бұрын
That's an interesting question, Jake. I think it has to do with the fact that while cathode followers produce relatively high current compared to pre-amp tubes, the current levels are nowhere near high enough to drive a speaker to high volume.
@skippyi6969
4 жыл бұрын
THIS is the way to teach !!!!!!!!!!!!!! Thx so much
@UncleDoug
4 жыл бұрын
Thanks, BB :)
@alexnuhn7973
10 жыл бұрын
looking forward to part 2, keep em coming.
@UncleDoug
10 жыл бұрын
I'm working on it, Alex. Hopefully, everything will fit into Part 2 and I won't have to make a Part 3 :O
@michaeld8975
10 жыл бұрын
I was listening to this as a podcast right up until we got to Russian dancer and thats when I put down the soldering pen.
@UncleDoug
10 жыл бұрын
I hope you put the soldering pen down so you could turn up the volume and take notes, MM.....not to do a quick KZitem search for "Russian Pole Dancer" :)
@baulaucheung1598
4 жыл бұрын
Thanks for this well-researched and well presented lecture. However, I have a few minor things regarding the topic on transformer and rectification of a-c to d-c from other lectures. 1. Maybe you should mention the difference between RMS and peak valves. 2. When people say 520V CT, don't they mean 260V, not 1040V as implied. 3. Ripple current. After the a-c is rectified, the voltage presented to the smoothing capacitor is the peak value. In this case, it is 260V d-c x 1.414. Not 260V d-c. This is very important as the valves will fail later because the B+ is well outside of their operating limits. 4. The ripple voltage is quite small, not as shown in the diagram. otherwise, you'll have massive distortion when you crank the volume up! These are only very minor details, however, it makes the difference between live and death of the output tubes! Thank you very much for your attention. Baulau Cheung.
@UncleDoug
4 жыл бұрын
You're welcome, BC. Thanks for your very nice comments and input. Please see my other videos that address most of your concerns.
@edbeckerich3737
6 жыл бұрын
Doug, be encouraged, I dig math, especially if it helps me with electronics. Love these videos!! Say hi to Rusty for me...
@UncleDoug
6 жыл бұрын
Thanks, Ed. We appreciate it.
@joecarson8281
10 жыл бұрын
This is what I needed to take the hobby to the next step. Thank you. Would this be a 200 series class?
@UncleDoug
10 жыл бұрын
Greetings, Joe. Yes, I would say that this is a little more advanced, since it's building upon some of the concepts from previous presentations. In Part 2, it will go another step further in complexity, but (hopefully) it will all still be easy to follow and understand.
@shaneoconnor-smith8860
8 жыл бұрын
Great vid, great help, thanks
@UncleDoug
8 жыл бұрын
+Shane oconnor-smith You're welcome, Shane.....glad you liked it :)
@jerryhelm7848
3 жыл бұрын
Might make a video on the time constant of caps in R/C networks as it relates to surface area of the plates and the dielectric material and thickness etc. The larger a plate the greater the microfarad value ( other factors being the same.) thus the relatively longer charge time. The cap doesn't really sense dc but rather stops charging when the plates become saturated thus impeding frequencies below its cutoff frequency. The smaller the cap the shorter the charge time, thus the higher the frequencies it passes (or attenuates if shunted to ground}
@UncleDoug
3 жыл бұрын
Excellent explanation, Jerry. Thanks !!
@georyans
9 жыл бұрын
Hi It's me again Doug please go into the weber kit website and look up the 5f1 as an example you will notice that it is a full guitar amp without any tone stack and the youtube videos of this amp sounds good George
@UncleDoug
9 жыл бұрын
***** George, the 5F1 Fender Champ is a great amp. As you noticed, it has no tone controls....you use the guitar tone controls instead. This is the same circuit that I used in my 7-part video series: Building a Fender Champ from Scrap Parts. If you're interested in building an amp from a kit, this would be a great one to start with.
@kevinkraushaar5655
5 жыл бұрын
Thankyou soon very much!
@UncleDoug
5 жыл бұрын
You're welcome, Kevin
@gmcguitars396
7 жыл бұрын
Great vids, thank you! love rusty btw
@UncleDoug
7 жыл бұрын
You're welcome, G. Rusty says "Hi".
@JHenzly
4 жыл бұрын
Again,Thank you for all of your videos. Very educational. I'm try to learn and understand as much as possible. May I ask, if the tone stack is at the beginning, does the input signal go through the tone stack then to Volume one? Am I on the right track ? Thanks. I keep going over your videos for refreshes.
@UncleDoug
4 жыл бұрын
The video was from quite a few years ago, JH. I honestly don't recall the exact circuit.
@garychen2899
8 жыл бұрын
Great Videos! I have learned so much about the basics of tube amps and electronic in general. Although I built couple of high fidelity 2A3 and VT-25 amps more than 15years ago. I rarely understand the theory behind it. What brought me here is the ongoing search to tone the voice of my amps, especially after spent a lot of time and money on different brand of tubes and high price film and oil capacitors. Now I feel that I have finally seen some light at the end of the tunnel through the high/low pass filters. One question: how is sound affected by using capacitors in parallel? For example, adding one 0.01uf/630v in parallel to one 1uf/630v in a CR filter?
@UncleDoug
8 жыл бұрын
+Gary Chen Thanks, Gary. Be sure you subscribe and watch my latest series on Power Supplies. Two caps in parallel simply add capacitance. To my knowledge the circuit would probably treat the two caps as a single 1.01uf cap. This is a little out of my field, since it's not a likely maneuver in a vintage tube amp. Good luck.
@seekeroftheways
2 жыл бұрын
Rusty’s too cool for amp school
@UncleDoug
2 жыл бұрын
.....and he's the headmaster :)
@JamrockVybzTV
2 жыл бұрын
preciate you uncle D
@UncleDoug
2 жыл бұрын
Thanks, JR. The feeling is mutual :)
@rangerrog
5 жыл бұрын
I got a question for you. I have an old Fender Deluxe D-3 Tweed I'v tinkered with, with limited knowledge, by putting a 30w output transformer, 6L6s instead of 6V6s and replaced the rectifier with Diodes. I have been using it for a power amp and it sounds awesome, tapped the phase inverter and eliminated the preamp section. I want to put the front end back but wondered if anyone ever wired the first valve in parallel since it is designated for two independent inputs and use both sides for a single input. Have you ever a 12AX7 in parallel? I talked to some kid back in the early 80s that said he did it with his rig for more headroom and a Fat, Bell like tone. Will it blow it up, ha!? I love your vids. Makes me wish I would have gone into building as well as performing. You'r an inspiration. Thanks
@UncleDoug
5 жыл бұрын
It wouldn't "blow up", but as you said, it is not a common way to wire a 12AX7. In my experience, too much gain in the pre-amp does not produce good tone or more headroom.....but the only way to know for sure is to try it and see. Meanwhile, I'm wondering how your power transformer is coping with all the excess current demands of the 6L6's.
@PiFBass
4 жыл бұрын
Uncle D., just found your channel and absolutely LOVE it - Electrical Engineering even an English major can understand. You teaching methods are superb, but I'm afraid after watching several of your videos in a row, I now know just enough to be dangerous. So, like a student raising his hand in the middle of class, please permit me to ask a few questions: 1. At the 6:20 mark when you point to the 2nd gain stage of V2 - why is there not a coupling capacitor between stage 1's plate and stage 2's grid? I thought letting plate DC from the previous stage onto the grid of the current stage was a BAD THING. Possible oversight on this drawing? 2: At 18:45 - if the low frequencies are blocked by the capacitor, and the high frequencies don't "like" the path to ground through the resistor, what's the point of including the resistor and path to ground in the circuit in the first place? Should the resistor path to ground be BEFORE capacitor to allow the low frequency energy being blocked by the capacitor a place to drain off? I'm just not seeing he purpose of that path to ground. 3. At 21:35 - shouldn't the HPF start to roll off at 500 Hz, with 100% of filtering (or 0% transmission) occurring at 3K Hz, based on your 0.1 uf example? Thank you for indulging me, and like I said, just enough knowledge to be dangerous....
@PiFBass
4 жыл бұрын
OK, disregard question #2. Note to self: watch the whole friggin' video before asking stupid questions....
@UncleDoug
4 жыл бұрын
@@PiFBass Thanks, Bill. We're glad you find the videos to be informative. 1.) When I make diagrams for specific topics, I often simplify them by leaving off unrelated components.....but it's good you noticed. 3.) Yes, to be consistent with the previous description of the 0.1uf cap, the threshold of passage to ground should begin at much lower frequency and not reach 100% until around 3KHz.
@PiFBass
4 жыл бұрын
@@UncleDoug Thanks for confirming my understanding. The diagram I was referring to was Fender's original, not one of your simplified ones. Even the pros miss a detail occasionally...
@UncleDoug
4 жыл бұрын
@@PiFBass Yes, they do, Bill.
@silasfatchett7380
4 жыл бұрын
@@PiFBass The pros didn't miss a detail. V2 is configured as a direct coupled cathode follower. The plate voltage of V2a is applied to the grid of V2b, but current flowing in V2b's cathode load resistor develops a voltage at the cathode which is slightly higher than the voltage on its grid. The grid is therefore negative with respect to the cathode, which is the condition necessary for V2b (or indeed any tube) to operate. There is no need for a coupling capacitor. It's not the absolute voltage on a tube's grid that matters, it's the voltage on its grid with respect to its cathode.
@kenorefice5313
5 жыл бұрын
I love your videos, they have taken me a long way in learning about tube circuitry. Can you explain or point me in the direction on understand a bit more? I don’t understand how the signal flows from the bass pot to the volume, it looks like it needs to go through the treble pot to get to the volume but that would cut it off.
@UncleDoug
5 жыл бұрын
Thanks, Ken. I'm not sure which diagram or stack you're referring to. Please give me a specific time when it appears in the video.
@nickzeak6546
9 жыл бұрын
Hi uncle Doug! Love your videos. I have a question about the output for the midrange frequencies. Towards the end of the video, you changed the potentiometer for the midrange filter on the Marshall to a lower value. This put a greater dip and less gain in the midrange frequencies. Why did that work? Is it because the output resistance from the midrange was lessened, resulting in less gain? Thank you for your videos!
@UncleDoug
9 жыл бұрын
Nick Zeak Tone stack interactions are quite complex, Nick.....alteration of any single pot setting will also affect the other two......but, as with all passive tone controls, reducing the resistance of the mid-range pot simply allowed more of that portion (mid-range frequencies) of the signal to go to ground. This resulted in a decrease of mid-range frequencies being sent to the output tubes and speaker, and a resulting dip in the middle portion of the frequency spectrum.
@wildbillpreston
9 жыл бұрын
Thanks Uncle Doug
@UncleDoug
9 жыл бұрын
wildbillpreston You're welcome, Wild Bill :)
@kfowler8
7 жыл бұрын
outstanding!
@UncleDoug
7 жыл бұрын
Thanks, KF :)
@lindseymontana945
6 жыл бұрын
Hi Uncle Doug, I enjoyed rewatching this classic, especially with the cameo by gray long haired fluffy kitty, and of course always good to see Rusty footage. I'm wondering, have you ever discussed the Gibson GA-30 single knob tone circuit? It varies the frequency response by shunting signal off the bias resistor.
@UncleDoug
6 жыл бұрын
Thanks, Lindsey. Sadly both of those furry pals have passed away. I have a hard time watching the old videos for that reason :( I looked up the GA-30 and see that it's an adjustable negative feedback loop, which they called a "Tone Expander". Yes, I have discussed adjustable NFB loops in several previous videos.
@benjaminmiller593
10 жыл бұрын
I love your videos! I am a budding builder. I started with stomp boxes, and am getting ready to build a tube amp. You have made the whole process much less intimidating. I was wondering; is there a resource that you would recommend for learning the math? I am not shy. I made it it through differential equations in college, even though I was a biology major. Basically, I want to be able to confidently modify current specs, and maybe design my own.
@UncleDoug
10 жыл бұрын
Greetings, Ben, and thanks for the kind words. I'm not sure if you have already watched my other videos describing all the basic aspects of amplifier circuitry. Re a math resource, I can't really name one, but you should become thoroughly conversant in all aspects of Ohm's Law, which is rather simple math, and perhaps watch more instructional videos on KZitem or use specific Internet searches for information you seek. I use both often and find them to be preferable to written resources. Best of luck :)
@williambarnes7642
4 жыл бұрын
well, I was really enjoying learning tons about amp circuitry. Then I am now forced to stop this video learning session to go watch a Russian pole dancer. You shouldn't say such things around suggestive people. All kidding aside, I love your style of teaching.
@UncleDoug
4 жыл бұрын
That's great to hear, William. I'm glad the videos are (almost) as enjoyable as watching Anastasia in action ;) Thanks so much :)
@martinlucero9594
3 жыл бұрын
Uncle Dog... your videos are Awesome.... Thanks for your time and dedication!!! I want to know just using a 6L6 or EL84.... how much power (1, 3, 5, 10, 20W..??) can I get from just one Tube using it for a home HIFI Stereo Amp... For a Stereo Amp Would I need two tubes right? Thanks for your response!
@UncleDoug
3 жыл бұрын
This information is in any Tube Handbook, Martin. A single 6L6 in Class A mode produces around 17.5W @ PV of 270V. An EL84 will only produce about 6W @ PV of 250V. If your circuit is single-ended, you would need one output tube per amplifier.
@Nickpaflas
8 жыл бұрын
Uncle Doug, I knew you were cool, but I didn't know you were cool enough to park your dune buggy in the living room.
@UncleDoug
8 жыл бұрын
+Nick paflas Yes, the wife resisted at first, but finally gave in when I showed her how the exhausts could be used as a barbecue grill :)
@NoSeAsuste
7 жыл бұрын
Thanks for your videos again. Please can you talk about Cathode Follower a bit deeply? I have heard that some tubes do not work properly at this position, due to heater to cathode maximum voltage.
@UncleDoug
7 жыл бұрын
There is a lot to be said about cathode followers, and the Valve Wizard says it quite well: www.valvewizard.co.uk/accf.html
@NoSeAsuste
7 жыл бұрын
Uncle Doug: Thanks!
@UncleDoug
7 жыл бұрын
You're welcome, No Fear :)
@fakundofrontera
4 жыл бұрын
Hi Uncle, im restoring an old projector amp and have (1V) 7025 for pre amp and then go to the (2V) 12ax7 for phase inverter, im wondering if i can apply some changes on the preamp copying one of the two schematics that you show for the examples, omiting the second tubes for preamp...And pass directly to the phase inverter with only the two triodes of the 7025-V1-...Other cuestion is if i can also do the Cathode F that you mencioned for loss volume if i use the tone stack after the V1...Have a great day, learning a lot from your vids and thanks for sharing your experience and knowledge!!
@UncleDoug
4 жыл бұрын
It's very hard to make long-distance predictions, FF. My advice is to try it and see. Good luck.
@fakundofrontera
4 жыл бұрын
@@UncleDoug i gonna try! thanks dear unclee!!
@jamesprisciandaro3144
6 жыл бұрын
Uncle Doug is my hero :)
@UncleDoug
6 жыл бұрын
Thanks, James. I'm flattered :)
@jamesprisciandaro3144
6 жыл бұрын
No, no, no - THANK YOU! I learn more from one of your videos than from fishing around the internet for hours and hours. You are a gifted teacher!
@UncleDoug
6 жыл бұрын
Wow.....thanks again, James :)
@W1RMD
3 жыл бұрын
At the risk of exposing my limited knowledge; if .1 uF blocks almost all of the signal below 500 hz, then sending a 50 hz through a .047 uF really shows the EXTREMELY HIGH impendance of the grid of the output tube(s)! (Jack probably already knows this)
@UncleDoug
3 жыл бұрын
Thanks for your input, Ryan. If you're speaking of the .047uf "Death Cap", it does block 50 to 60Hz AC from reaching the chassis (ground).
@W1RMD
3 жыл бұрын
@@UncleDougI meant the grid(s) of the output tube(s). I guess it's usually .022 or .1 uF. I guess it does't take much getting through to drive a 6V6 at all.
@stephenrioux6821
4 жыл бұрын
Great video! Where can I find that video referenced at 22:50?
@stephenrioux6821
4 жыл бұрын
Make that 22:40.
@UncleDoug
4 жыл бұрын
Do a search for Anastasia Pole Dancer
@Shockszzbyyous
7 жыл бұрын
is there anyway to drive 8/4 ohm speakers directly with tube amps ?
@UncleDoug
7 жыл бұрын
I don't fully understand the question.....can you drive eight 4 Ohm speakers with a tube amp? Yes, indeed. If by "directly" you mean without an output transformer, then no, you can't.....unless the amp utilizes a transformerless circuit, which is a whole other kettle of fish. Check the Internet for info.
@lifesglorydead
10 жыл бұрын
Alright Doug, I've watched both videos and I've got a question for ya... Since cathode followers operate at just under unity gain, it's safe to say they're not doing much work other than providing isolation/buffering, right? That said, would there be any negative *sonic* implications to substituting a cathode follower stage with a solid state (discrete or IC) voltage follower circuit if the right considerations were given with regard to input/output impedance?
@UncleDoug
10 жыл бұрын
Josh, you are correct that cathode followers offer no gain (or tonal modification), only impedance matching for the "leaky" passive tone stack. I have virtually no experience with integrated circuit components, so I am only guessing, but IMHO the substitution you suggest should not have a negative effect on tone if the impedance is properly matched. Good luck !!
@silasfatchett5693
7 жыл бұрын
The stage consisting of the two triodes not only produces a low impedance feed for the tone stack, but also deliberately introduces second harmonic distortion to 'warm up' the sound. This depends on how tubes operate and would not happen with a solid state follower.
@DeanMichaelDorman
7 жыл бұрын
Uncle Doug, wouldn't the resistor need to follow the juncture in the path in a low pass filter to encourage high frequencies to go towards the capacitor? It seems that the way you have it in the video, the resistor is really doing nothing to alter the signal path and both outed after would have the same resistance, or arguably the path without the cap would have less, thus letting the signal fully pass by...?
@UncleDoug
7 жыл бұрын
What's going on is way more complex that you realize, Dean. Do a Google search on capacitor time constants and detailed interactions between capacitors and resistors. The frequency discrimination of capacitors is related to the speed at which they can charge and discharge.....and resistors, either before or after the cap, can affect this rate.
@silasfatchett5693
7 жыл бұрын
One way to look at a first order filter is as a resistive potential divider where the resistance of one of the 'resistors' (i.e. the capacitor) changes its value depending on the frequency of the applied signal. If the input is applied to the resistor then as frequency rises the 'resistance' of the capacitor falls, and a smaller proportion of the input signal appears at the junction, cutting treble: i.e. a low pass filter. If the signal is applied to the capacitor then as frequency falls the 'resistance' of the capacitor rises, and a smaller proportion of the input signal appears at the junction, cutting bass: i.e. a high pass filter.
@moorec1053
4 ай бұрын
I cannot be the only one....... I come for the comedy, but stay for the education. I would be interested if this is, At All, an age thing. I was born in 1960. I find Dougs humor to be pretty.....well, what would Doug say.....top shelf.? 🙂 Not only is his humor, often, quite dry but it is also educated and old-mannish....... In a mans-man kind of way. And that is what happens when you have to be or choose to be clean. It forces you to be clever. Just 2 examples....... The Smothers Brothers and Seinfeld, Not only could they not swear, but even their risque stuff had to be PG. But they were crushingly funny. Anyway....... on to Act #2 of this Tone Stack Comedy
@UncleDoug
4 ай бұрын
Wow.....Thanks so much for the kind assessment, Mr. Moore. I try to speak publicly as if my mother was listening. She was a nice lady and had a great sense of humor :)
@moorec1053
4 ай бұрын
@@UncleDoug ...... You are very welcome. Thank You as well :-)
@gregkrupa2004
8 жыл бұрын
Hi Uncle Doug i have a 64 Gibson medalist,, is there a way to add more grit/distortion to this amp to a channel internally? Its a bit to clean for my liking. As always thnx for all these great videos its teaching me much more then i ever thought id get to learn.
@UncleDoug
8 жыл бұрын
Greetings, Greg. Your best bet is to simply buy an overdrive pedal and insert it between the amp and guitar. Unless you are well versed in circuit modification, it's best not to alter an original, working amp.
@gregkrupa2004
8 жыл бұрын
Im already doing that, and it is running well. Just need something to fix. Your right ill keep it as is. i guess i was hoping for an easy adjustment. Thnx
@UncleDoug
8 жыл бұрын
It would not be easy to do or undo, Greg. You're better off with the pedal.
@stereopolice
3 жыл бұрын
9:39 the cathode follower is a Unity gain buffer.
@UncleDoug
3 жыл бұрын
Thanks for your input, SP.
@silasfatchett7380
3 жыл бұрын
Actually, a little less than unity.
@roymycock413
9 жыл бұрын
Hi Doug, greetings from the UK. Just wanted to say how much I have enjoyed your U-Tube teachings on guitar amps. I am just considering buying a small tube amp to play harmonica through,(Arrrrrrrrrrrr)Ihear you say! anyway the most experienced players say tube amps are best. However, I knew nothing about tube amps except they were heavy and they glowed in the dark(lol) Now after watching your teaching clips I am amazed how easy you made it for me to understand. You have a real skill in taking what I consider to be fairly difficult material and explaining it in layman's terms. In the end though you have imparted the info so that I feel I have a more technical understanding of the subject rather than just a layman's view. I am watching the material several times, just to try and make it stick! I am no spring chicken (68) so the memory is not what it used to be. I am looking forward to watching more of your clips but in the mean time, once again, thank you so much for your time, effort,expertise,dedication and the inspiration you have given me through sharing your knowledge. Just one more thing, have you ever done a clip on hand wiring a small amp from scratch. I have seen the one where you make the chassis and the cab etc but its the actual wiring I am talking about. I can do all the making of the cab and chassis, but when it comes to the actual wiring up I am not too good at following schematics. I would love to build my own simple amp like the one you made in the clip, so if you have any plan of attack written down or u-tube clip ( like wiring it a section at time etc) I would love to hear from you. I know it must sound like I am asking for the electrical equivalent of (painting by numbers) so to speak, but if you don't ask you won't know if there is anything out there! Many Thanks Roy M.
@UncleDoug
9 жыл бұрын
Greetings, Roy, and thank you for your very kind and thoughtful comments. I'm glad to hear that the videos are helpful. I think the problem with wiring stems from an inability to interpret schematics. They are like a map for the circuit, providing specific information as to every connection and component placement. A video showing how to connect a wire from one terminal to another would not be particularly instructive, and the ability to interpret schematics is not something which can be effectively verbalized. It's more like learning a new language. You must develop a vocabulary, an ability to translate symbols, and then practice a great deal. Download the schematic for a 5E1 Fender Champ amplifier and study it carefully. Divide it into sections, pre-amp (12AX7), output (6V6), and power supply (5Y3). I have posted videos explaining each of these sections. Learn the symbols for capacitors, resistors, transformers, tubes, etc. Trace the high-voltage (DC) from the power supply to the tube plates. Trace the signal from input to output. Trace the AC to the tube heaters. Once you have mastered the simple Champ, try a more complex circuit, like the Princeton. It will require time and effort, but these are things that you must provide if you really want to achieve a better understanding. Good luck.
@kevinkraushaar5655
5 жыл бұрын
Actually could I please talk you into that 30 minute in depth discussion about the resistor in this application? Or can you point me to a book or article on the subject?
@UncleDoug
5 жыл бұрын
If you are wondering about how the resistor works with the capacitor to cut off or pass certain frequencies, it has to do with the time it takes for a capacitor to charge, which is called the Time Constant. The TC is based on the value of the resistor and the capacitor. If you change either value, you change the TC. Low value caps, i.e. in the picofarad range, have extremely low TC's.....they can charge up very quickly and thus can handle high frequencies quite well. High value caps, i.e. in the microfarad range, have high TC's......they take time to charge and thus are better suited to low frequencies. There are all sorts of discussions online regarding this process. Here is one: en.wikipedia.org/wiki/RC_time_constant
@1inDnile
8 жыл бұрын
What does the phase inverter do? Doug
@UncleDoug
8 жыл бұрын
+david dkeole I have posted a video on Phase Inverters that will answer all your questions, David. Please check it out.........
@noreaction1
7 жыл бұрын
By fine tuning, do you mean in terms of the cutoff frequency, or the slope (how quickly the frequencies pass from 100% to 0%), or do you mean the resonance at the cutoff frequency?
@UncleDoug
7 жыл бұрын
I mean by substituting various cap, pot, and resistor values to find the combination that provides the tone you seek. Calculations can get you in the ballpark, but fine tuning is primarily done by experimentation and trial and error.
@silasfatchett7380
4 жыл бұрын
The filters Uncle Doug is describing are 1st order RC (resistor/capacitor) filters which have a slope of 6dB/octave. The resonant frequency of an LC (inductor/capacitor) filter does not occur in an RC filter. Changing the values of the capacitor and/or the resistor in an RC filter simply changes its cutoff frequency.
@djpaquito
8 жыл бұрын
Great!
@UncleDoug
8 жыл бұрын
+Roberto Paramio Thanks :)
@jackweber9078
9 жыл бұрын
I'm curious, are different frequencies more vulnerable to control in different areas of the preamp? Ie, the treble and mids right after the first gain stage and bass, presence, resonance or whatever later? Or any variations of that?
@UncleDoug
9 жыл бұрын
Jack Weber An interesting question, Jack. I would imagine that the control vulnerability is fairly consistent for all frequencies at any one area. I say this because in most tone stacks, all three frequency controls are located in the same spot. If there were a better place for, say a bass control, then I think the major manufacturers would know it and place it there.
@greywolf271
8 жыл бұрын
+Jack Weber The effect of potentiometer placement in circuits affects the overall complex impedence of the previous stage's output and the input of the stage under consideration.In simpler terms if you have 2 valves V1 and V2, V1's output has a complex impedence, which can be calculated from manufacture's data and the circuit components.V2's input similarly has a complex impedence.Placing a potentiometer between them will affect overall response.How much would that upset your guesswork ? It's much simpler in audio frequency amplifiers where ground plane effects are not a consideration, unlike in RF amplifiers.So it depends of the tube characteristics and the circuit components used.
@GuteisFinger
10 жыл бұрын
Another most excellent video Uncle Doug. I've watched it a couple times and enjoyed the Pt.2 amp comparison between the Fender Marshall and Vox amps. Now I know why the Beatles with their Voxs sounded so much brighter than other Brit groups using Marshalls. I was poking around at digikey's site afterward and found their online schematic tool. I know you like to draw your own, but this might come in handy for more complicated circuits. www.digikey.com/schemeit Thanks again for clear coverage of another dense topic.
@UncleDoug
10 жыл бұрын
You're quite welcome, Carl. Rusty and I sincerely appreciate your input. I will check out the digikey site....thanks for sending the link.
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