I was recently gifted a Tektronix 2235 and just finished this first video and wanted to say thank you so much for a easy to understand approach. I actually take notes in a graph composition notebook. I'm 53 and wish I started sooner but I am doing it now. Thanks again.
@solodolo6018
9 ай бұрын
Better late than never!
@kharakim
3 жыл бұрын
Thanks so much for taking the time to do this series. Extremely helpful for the likes of myself who hasn't used a scope in more than 60 years. Best wishes to you and your family for a healthy, happy, and prosperous new year.
@mrkattm
3 жыл бұрын
I don't think you are using the word Domain correctly, oscilloscope operate in the time domain where as a spectrum analyzers operate in the frequency domain, I have never heard of a voltage domain.
@H-77
3 жыл бұрын
Those non-inductive wirewound resistors typically have the wire wound in both directions, which results in a relatively low inductance. Not zero, but close. Unless you're taking really low distortion measurements, it's probably not critical to have it be ultra-low inductance. After all, a speaker is somewhat inductive. It is definitely worth getting four resistors though, because you want to be able to test into 4 ohm loads.
@theglyph
3 жыл бұрын
Love this but shouldn't it be Y axis being voltage and X axis being time? This is at the 3 minute mark and sorry for being an algebra nerd. :)
@Blueglow
3 жыл бұрын
Yes, I always find bloopers after I've posted online, LOL. I also said mhz at a point I should have said khz
@jurgenkellers3966
3 жыл бұрын
Me wise guy here ;-) Perhaps its graticules, not gradients in the context of V/div. Gradient is more like a measure of how steep a slope of some physical quantity is. Good vid in any respect--thanks!
@MrDoneboy
3 жыл бұрын
I was taught, that they were called graticules as well.
@JeffCounsil-rp4qv
3 жыл бұрын
Alright Mr. "wise guy", that is true. But a lot of people can think of these things in a perspective that gets the "point" across without having to take a dedicated course. I myself thought the same thing about the "technicality" of the graticules being the actual "technical terminology". But I realize there are so many people just learning the basics. They'll learn these "official" terms as they gain more experience when things become "less confusing".
@jmiles1960
3 жыл бұрын
Simply the best presentation on the How, What and Why of an Oscilloscope and accessories for the audio bench. Straightforward, practical and understandable. Mark you're the best! Thanks for sharing your expertise and time. I am getting back into vintage electronics and have discovered your videos as my main source of education. Thank you. Thank you. Thank you!
@Waltkat
3 жыл бұрын
Love this series. Thank you. Concerning the channel selection buttons on that Rigol, that's why I won't buy a Rigol and will be buying a Hantek DSO2D15 which has individual controls for each channel and an internal arbitrary waveform generator. It will be an addition to my Tek 465 scope and if I ever get around to repairing them, my two HP 1741A scopes.
@youtuuba
3 жыл бұрын
This video lost my confidence when the assertion was made that the sine wave on the analog scope looked smoother because the tube could not respond, and that the ragged waveform on the digital scope was more accurate. No....the signal source is likely to be analog in origin, and it does not have those jaggies, and the displayed jaggies are due to the rough quantization and display resolution.
@rickywilson1947
3 жыл бұрын
Thank you! I've learned so much from your videos. You make electronics so much clearer for this old knuckle dragging retired Soldier.
@SuperFredAZ
3 жыл бұрын
Slight confusion: the lines on the Oscilloscope are called graticules, not gradients.
@kostaskritsilas2681
3 жыл бұрын
They are called graduations, not gradients or graticules. From Miriam Webster's dictionary: graduation: a mark on an instrument or vessel indicating degrees or quantity. In this context, Mark is using them to measure a quantity. From the same dictionary: Graticule: the network of lines of latitude and longitude upon which a map is drawn. in Marks context, he is using the graduations to measure time or amplitude.
@SuperFredAZ
3 жыл бұрын
@@kostaskritsilas2681 look up graticule, also reticle, gradations is another acceptable term.
@SuperFredAZ
3 жыл бұрын
@@kostaskritsilas2681 just because you found one word in the dictionary that means something, it doesn't mean that there are not other words that have the same meaning, here's the Wiki entry:"The graticule is a grid of lines that serve as reference marks for measuring the displayed trace."
@HazeAnderson
3 жыл бұрын
I settled on the Hantek DSO5072P two channel, 70MHz digital oscilloscope and a Koolertron two channel, 60MHz arbitrary waveform function generator. I still want an analog scope with XY mode so I can experiment with oscilloscope music some time in the future (music that displays fantastic images on an oscilloscope in XY mode). Cheers!
@bfpsa64
3 жыл бұрын
Very excited for this series. Been watching your videos for a while now and you are great at explaining what you are showing. Thank you for the time you put into everything you provide us hobbyist with. Happy New Year
@victorliguore1293
3 жыл бұрын
Probably the best YT video I've seen on any subject matter. I can't wait for the rest of the series...thank you.
@thatampguy
11 ай бұрын
My man. I just love your channel so much. It's packed with such useful, practical and well presented material. I'm fairly confident that you're content has put a lot of bread on the table for mini folks and I hope you're being well supported by them.
@VioletDeliriums
Жыл бұрын
Thank you...I have been looking for someone to explain use of oscilloscopes for visualizing sonic waves for analysis so I can look at a sound and figure out how to reconstruct it...I am still a little confused why I would need a signal generator? Wouldn't that be the sound coming out of an amplifier or detected by a microphone? I thought the signal generator would be -- instrument (guitar, synth, etc.) via 1/4" jack to effects pedals to amplifier -- then somehow capture that signal and send it to the oscilloscope (maybe by direct connection via 1/4" jack out to something else in, or via a powered microphone connected to the oscilloscope). What am i missing here? Does the signal generator convert sound to volts? Why do I have to isolate the DUT's power connection? Is something going to explode? Maybe I need to watch more of these vids?
@wmand7
Ай бұрын
Do you have replacement suggestion in amazon for Jameco GRP-1200 Isolation Transformer and Syncwire RCA Cable, [10FT/3M] Nylon Braided 3.5mm to 2-Male RCA ? Since it is not available in amazon anymore
@andrewduncan4230
3 жыл бұрын
A thing to keep in mind when purchasing a scope, is how deep is your bench? The older ‘tube’ based scopes, are considerably deeper to accommodate the tube compared to the likes of the newer digital scopes like the Rigol which are the opposite!
@SinnerSince1962
Жыл бұрын
I agree whole heartedly. Sadly, because I'm so "old school", I love my Tektronix 2246. I know every button and knob, and like having discrete controls. I do have a Siglent 1104x-e, but haven't come close to mastering it's capabilities nor it's menu system. I also have an HP-54610b with it's memory module, which is an awesome piece of gear.
@jackovermyer3043
3 жыл бұрын
Just what I was looking for straight forward info on what's needed. Thanks looking forward to the next video.
@MrDjohi
Жыл бұрын
Are handheld oscilloscopes good enough to use for audio testing? Like 3in1 Owon HDS2102s?
@JohnDoe-bf1fw
3 жыл бұрын
I use Tektronix 2213A analog oscilloscope. I bought it brand new 35 years ago. Make sure the scope you get is in perfect condition and freshly calibrated. If you get some old junkie military surplus unit, you may spend more time working on the scope then on the circuit you are experimenting on. Also: DO NOT CONNECT YOUR OSCILLOSCOPE GROUND LEAD TO A HOT CHASSIS. IF YOU DO, ZAP!
@williamstevens7090
3 жыл бұрын
I picked up my Tek 2213A only this Summer. I was new to o' scopes and was surprised how easy it is to operate.
@JohnDoe-bf1fw
3 жыл бұрын
@@williamstevens7090 Way cool ! I'm sure you paid a lot less than I did. My Tek 2213A was $1,400 in 1985.
@SkunkieDesignsElectronics
3 жыл бұрын
Thanks so much for doing this series! Your channel has given me the tools I need to get into building my own tube amp :)
@johnm4962
10 ай бұрын
Thank you for this amazing video!!! THANK YOU
@srtamplification
3 жыл бұрын
Great video Mark!!! It may also be worth mentioning to the audience, that Variacs (Autotransformers) are not isolation transformers. Many people think they can double as such. Also, an isolation transformer, although electrically isolated from the line and neutral, is not necessarily isolated from ground. If you are going to use a 1:1 transformer for ground isolation make sure you check that the line side and load side grounds are not the same point electrically. For some, this can be fixed by a simple removal of a ground strap connection or snipping the ground prong on the line-side plug. I have a Tenma 72-1095 Isolation Transformer with adjustable voltage and it has a common ground. The load side plugs are connected to ground via a ground wire to the chassis. Disconnecting this wire isolates the load side. Just something to think about. Thanks!!!
@eebaker699
3 жыл бұрын
Great video for beginners like myself. Tube stuff isn't my bag. This video is very informative and educational. Thanks for sharing your thoughts.😁
@michaelmahar4066
12 күн бұрын
Been an audio engineer for 30 years (live sound, touring) and am just now getting into learning about this stuff. I was on it as a pre teen back in the 80's but got more interested in other aspects of the field. Now I've got some old reel to reel machines (Nagra IV-SJ x 2) I'm using to record the band I mix and those need maintenance so, off we go. Tektronicx 465 Purchased and now, thanks to you I'm looking forward to starting this journey of learning to care for my tools. Thank you.
@JasonCunliffe
3 жыл бұрын
@ Blueglow Electronics *** Note > at 8:42 you SAY: "zero to 20 MEGA Hertz" while the slide TEXT = 0Hz to 20kHz
@yannick930
3 жыл бұрын
Perfect, it's the last bit i have to aquire to begin the real work on the audio signal. I've been playing too long with swapping parts now it's time to really see what they're doing in the circuit. Thank !
@rewalton46
3 жыл бұрын
In ancient times when I worked at Tektronix, I used a 464 analog scope (I think that was the model). I learned to use it very well and loved it. A couple of years ago, I purchased (used) a Tek TDS420A digital scope with CRT display. Someday I might get it figured out. Like you, I grew up on the analog scopes and am struggling to get up to speed on all the menus, functions, etc., that my digital scope had. I just need to live long enough!
@BCbuddies
10 ай бұрын
I’m trying to follow along but I got to admit this is a lot hahah, I need some help please. I have a bk 1461 scope I got used for 20$ and I want it to display waves when I hook it up to my receiver when I player records or music. I have a strdh190 Sony. I’ve researched a few things and so far people have said to use a bnc to rca and a rca banana plug in the “hor input” and “GND” but I don’t think I can use those rcas because i don’t have a “tape input” (which people have said for it to be the best option) and the output on the receiver has opposite polarity? And can blow the amp. So I’m unsure. Can I use a splitter between my phono stage and my receiver? So my scope intersects the signal? Can I use a bnc to the 3.5m in the front?? Helllllppp
@bingosunnoon9341
3 жыл бұрын
I have a Tek 2246 100 MHz 4 channel I'd like to sell. Like new but don't want to deal with ebay. What are my other venues? Funny thing, in the department I worked in, you built your own test and measurement equipment for use in the shop. I don't think they do that anymore.
@SimonBauer7
4 ай бұрын
computer based dsos are (with a few exceptions, mainly cheap ones) pretty much all built very similarly to benchtop DSOs
@jesse75
6 ай бұрын
Scroll to 12;45. That's past all the preliminary bs.
@Gerrit-Max
3 жыл бұрын
I'll sure be following this series. I was given 2 scopes some time ago but not even looked at them, don't even know if they work. Gonna dig them out soon and get my self familiar with them.
@SouthShoreSonics
3 жыл бұрын
Great video. I picked up a BK 1474 for $50 Canadian!
@harryshector
3 жыл бұрын
Very informative video, Mark. I have two very minor points. I think the preferred term for the divisions on the face plate of a crt is ‘graticules’ rather than gradients. The other is, the crt’s for the analog scope are becoming rare, and are very expensive. A replacement will probably cost more than the scope itself, if you can find one. I think this is a factor which should be considered when buying something like this, especially from ebay. You are buying an absolute pig in a poke there. The digital scopes don’t have crt’s.
@Blueglow
3 жыл бұрын
I've heard them called both so not sure what's official. On the tube screen, agreed.
@databang
3 жыл бұрын
I’m from the future, the part 3 video which I was very interested in, told me to see Part 1🤣
@earthquake7769
Жыл бұрын
LeCroy 9400 2, channel? Would that work on audio?
@neevothespaniel
Жыл бұрын
Wow! What an incredible series of videos. Was absolutely critical in helping me trouble shoot my preamp restoration safetly!
@marcusjames1221
Жыл бұрын
Hi I live in the uk and I want to learn how to repair Audio equipment I have been watching your videos On oscilloscopes and other equipment I will have to buy but I can’t find part two or part three of the series you have been making can you point me in the right direction Were to Start learning how to use A oscilloscope ans all other Equipment I would have to get thank you so much for your video so far mark
@rciancia
3 жыл бұрын
Mark - looking forward to the rest of the series. This will help reinforce what I already know - really appreciate it !!! Ron
@gwbenites
2 жыл бұрын
Thanks for sharing your knowledge with everybody. Guys like you, D-Labs, (I think it's Terry), and Uncle Doug are really appreciated, and I think you guys are pretty rare today. My question to you is, in buying older (vintage) gear such as a scope, do you need to be concerned whether it's in decent calibration? How do you verify, by comparing with a audio generator?
@kevinhamming4514
2 жыл бұрын
Basically you need a device that is known to be calibrated.. Like a Fluke meter. use that to measure and compare to the voltage reading on the scope. adjust the scope tp read the same voltage as the meter.
@johncasteel1780
2 жыл бұрын
Like Kevin said, there are various ways of checking calibration - sort of, but for most audio work, calibration is not that important. What a signal looks like is more important than whether it is 1.8 volts peak to peak or 2.0 volts.
@dark666apoc
3 жыл бұрын
Just beware the hantek 1008c is only rated for a bandwidth to about 100khz
@edgar9651
3 жыл бұрын
Thanks, great video! About that probe set for 22USD (or similar). What is the quality of those? I.e. an original Rigol probe cost 40UDS - for one. Are those Amazon probes maybe only good enough for low audio frequency but possibly they wouldn't be as good for higher frequencies?
@JeffCounsil-rp4qv
3 жыл бұрын
That's why you "calibrate" your probes.
@fredflintstone8048
3 жыл бұрын
Horizontal axis (time) is X axis, Vertical axis (voltage) is the Y axis.
@garthhowe297
3 жыл бұрын
Perfect timing... already have much of this equipment, but just learning to use it with audio equipment.
@JohnDoe-bf1fw
3 жыл бұрын
Is your dog part Chihuahua? Best way to learn electronics is in college. DC, AC, Electronics 101 to 103. No time for college? Then learn: Ohms Law, kirchhoff Voltage and Law, Thevenin's Theorem Albert Malvino "Electronic Principles" is a really good book. Hook up the example circuits in each chapter and test them with your equipment. You will soon be designing your own audio amplifiers using discrete components.
@garthhowe297
3 жыл бұрын
@@JohnDoe-bf1fw Actually, I have a 3 yr College degree in Electronics... but didn't work at the component level for long, and don't recall doing much related to AC, other than motors and such. My dog was a Welsh Corgi.
@adrianh63
Жыл бұрын
I want to buy an oscilloscope I’m a newbie any suggestions? I will use it to test waveform on my analog synthesizers
@peterkemp8633
7 ай бұрын
Really good,very interesting ,thankyou
@abijeetrs6522
6 ай бұрын
Hello how many min volts/div should I look for an oscilloscope to use with audio signals ?
@jensonmarugan6000
Жыл бұрын
you suppose to give more details about Isolation and isolation transformers , there is the mistake most of the beginners do and destroy the equipment's.
@JamesGMunn
3 жыл бұрын
Hopefully, in your safety video you will cover how the ground on the oscilloscope probe will bypass the isolation transformer protection and can create an unexpected and possibly dangerous current path. I find that this important piece of safety information is rarely covered in these types of tutorials. People get used to using multimeters behind an isolation transformer, which is relatively safe, and then move up to an oscilloscope and don't understand that the scope ground is tied directly to the wall plug ground which may be tied to everything plugged in around your bench.
@kevinhamming4514
2 жыл бұрын
The only problem would be a potential ground loop which is avoided by everything using the same ground point for everything on the bench.So if everything is at the same ground potential, how is there a problem, or are you referring to using some different type of grounding system?
@JamesGMunn
2 жыл бұрын
@@kevinhamming4514 The purpose for using an isolation transformer while working on high voltage devices is to avoid getting shocked if you accidentally touch the high voltage path and some other part of your body happens to be touching some other earth grounded thing such as the bench itself or a power supply etc. This works because there is no current/circuit path from the high voltage system to the earth ground thanks to the isolation transformer if used properly. When you clip the ground lead of the scope up to the device's high voltage ground or usually the chassis, now there is a current path possible from the high voltage you accidentally touched, through you, to something grounded such as the bench or equipment to the outlet ground, to the scope ground and back to the chassis. With a proper isolation transformer, you would have to touch the high voltage and also the chassis ground or other path in the equipment in order to create a circuit through you. There should be no complete circuit from the high voltage, through you, to something on your bench that is grounded. Of course, you have to be careful not to create an accidental path, such as through the scope ground lead, and lose the primary benefit of the isolation transformer. I hope this helps explain it.
@kevinhamming4514
2 жыл бұрын
@@JamesGMunn The Shock hazard to me is why you shouldn't work on anything that's not grounded. I saw someone who uses a light bulb ( high watage, low filament resistance) . The current goes through the light bulb and will light brightly if there is a short. This is a short circuit device that protects from too much current thereby prorecting the device under test., Also yourself to some extent. You don't work on anything with your test equipment not grounded, why work on something that's not grounded? So your going to disconnect your ground? Amps don't work good not being grounded because of induction 60 hz hum. I do not measure high voltages myself without powering the amp down first, then connect my probe, then powering the amp up by plugging the chord in the ac receptacle with the switch on the first time it's powered up. In case anything goes up in smoke I am a good distance away from the amp. Thereafter I do the same thing after making changes. I reduce the risk of ever coming in contact with high voltage this way. You will eventually touch high voltage. It will happen. Use one hand . If you feel safer then that's best way for you, then leave it ungrounded. . However I have come in contact with high voItage. Only once I contacted ground with one hand and high voltage with the other. I changed my practice then at that point. I understand not grounding yourself or isolating yourself from it. That's why the one hand rule. I avoid that by not moving probes around when it is powered up.
@alexmihai22
3 жыл бұрын
Good clip, but you may want to change your microphone.
@marcspardello1254
3 жыл бұрын
QUESTION ON TEST EQUIPMENT FOR NEW/ASPIRING TECHNICIAN. I have Sencore Z-Meter, LC53. Should I keep this meter, or am I better served selling this and buying more basic test equipment. I have a fantastic B&K 820, to test capacitors. My end goal is to completely restore and improve vintage Matantz and Sansui stereos (I am an Engineering student, as well). I may do work on CRT projectors like Barco's and Marquess down the road
@johncasteel1780
2 жыл бұрын
Keep the Sencore. The BK 820 may do 80 - 90% of what the Sencore can do, but sooner or later, you will need that 10 - 20% of the Sencore's capability.
@geezberry8889
Жыл бұрын
most of these tektronix are used. what do i need to look out for when buying used? how do i know it is calibrated correctly?
@grahamluscombememories9897
5 ай бұрын
Can we not just use one of the APPs on our phones that generate frequencies like Fequency Generator?
@Kastari_Ck
3 жыл бұрын
Punya skema oci BBC M6002 bosku
@alexanderhyams
2 жыл бұрын
Great video, however, I cannot find a KHZ Oscilloscope---they are all up in the 40,50, 100Mhz ???
@johncasteel1780
2 жыл бұрын
Umm, you're serious? OK, assuming you *are* serious, a modern, or even, semi-modern scope will have a frequency response from DC to the upper rated frequency. It is not like, for instance, a signal generator or spectrum analyzer which do have a lower frequency limit.
@richardr.5177
3 жыл бұрын
Great value video series Mark. I already learned so much from you and have turned it into practical use. Looking forward to the next video’s.
@bergarteric5713
3 жыл бұрын
Class !!! but a good multimeter is need too .... a precise of coarse !!! Happy good year Eric from France
@JeffCounsil-rp4qv
3 жыл бұрын
And it pays to get a good quality meter. Although the "cheapos" do work, they don't work very well after a while and will become intermittent from oxidation on all the contact areas. Areas like the switch contacts and probe sockets where you have to "wiggle" them to regain non-resistance contact. I finally went with Fluke when I could afford them and never looked back. There are other "top shelf" brands as well. I still use my "cheapo" meters a lot for things like "quick" checks and the like to save wear and tear on the Fluke meters.
@tcape72
2 жыл бұрын
I'm gathering the stuff I need according to your excellent video, can't wait to watch the rest of them! I have a B&K model 1655 power supply, have not used it yet, but I bought out a TV repair shop a few years ago and I like messing with electronics though I'm no expert.. Would this be considered a variable power supply and it also has 2 "isolated output" receptacles? Would that be considered equal to the isolation transformer you referred to in your video? Thanks!
@Blueglow
2 жыл бұрын
If it has isolated outlets, you are good. But most variacs aren't isolated. I use an old RCA isolation transformer in line with my variac. They are easily found on eBay.
@brianwong4175
3 жыл бұрын
Great video and good advice. Be sure to also get 50 ohm BNC terminators for your scope inputs to assure that you'll see correct voltage readings from your signal/function generator.
@oldfartron1205
Жыл бұрын
You sound like the actor Billy Bob Thornton.
@acdcjustthebest....8980
3 жыл бұрын
Hi, I was hoping with your experience and expertise if you could guide me to use the correct lubricant to service my equaliser sliders on my 1985 Marantz PM750DC. Cheers John
@SPINNINGMYWHEELS777
Жыл бұрын
Today I found a signal generator and nice HP tube screen Oscilloscope 100MHZ in our local electronics recycling - . the generator has a gear inside broken so that has to be fixed (it can't dial to the comb filter) I think it's a simple fix.. and the HP fired up perfectly and your 3rd part video got me dialed in an confirmed. I'm SO happy to have found these today. I agree with the bench space thing. and I have a spot on the bench for this... my first non computer based osc. Appears my HP has pretty much all the same features as that Tektronik minus 2 less channels - 100MHZ is overkill for audio so that's all good ! I had to jerry rig an adapter..will order one of those packages from amazon you showed. Looks great for $20. I can see some great use out of the modern digital units.. but I too hate accessing so many menus. I'm more of a tactile operator. I can hunker in to the 'interface'..but would prefer not to.
@zihotki
3 жыл бұрын
In regards with the oscilloscopes and generators, there are actually pretty good cheap digital chinese ones currently available from such manufactures as Hantek (DSO5102), Uni-T, and even pocket-size ones like from Fnirsi 1C15 on Aliexpress and other marketplaces. You can get full setup for 100-200 bucks. And it's more than enough for the audio.
@JeffCounsil-rp4qv
3 жыл бұрын
Very true. But how well do they work a year later? Have they drifted out of spec? Have the connectors oxidized enough (from cheap plating) to cause erroneous readings? I have found most Cheaper Chinese stuff to be in serious "question" a mere year later. Sometimes only a few weeks later. Although my Brother's Hantek seems to be one of the better brands, it even has issues only 6 months later with one channel going very noisy. The old saying never fails... "You get what you pay for"....
@zihotki
3 жыл бұрын
@@JeffCounsil-rp4qv That could be true that there may be some quality control issues. And of course never trust the specs they write, it's a lie. But for audio work it's more than enough. As for me, I own a $150 Hantek too for about a year+ and it's still reliable. Most of the time the issues would be indeed oxidation or other very easily fixable stuff. "You get what you pay for" is very true but getting the best equipment for everything - I don't have that much money, I'm not from the Gates or Bezos family, and I have a limited budget which I would rather spend on better drivers for speakers. Plus it's just _one of_ my hobbies, we're not talking about making money with it, right? :) Even then you can get a cheap one until you get a stable flow. As for old aftermarket models, who could give a guarantee that they won't fail too? At the end it's the same pig in a poke.
@JasonLeaman
3 жыл бұрын
This is going to be a Good few videos ! Yes please !
@christiand6768
3 жыл бұрын
Is a tongenerator app in your smartphone good enough?
@gamerpaddy
3 жыл бұрын
26:40 the closed aluminium case resistor is also wire wound.. just potted in a metal case. but maybe the way they wind them cancels out the inductive effects like winding it back and forth, not just in one direction somehow. there are 100W TO-247 thick film resistors that are definately non inductive (except the leads) and cost half. but require a heatsink or being submerged in a bucket of water. first image on google images when you search for non inductive wire wound resistor is what it could be.
@JeffCounsil-rp4qv
3 жыл бұрын
I have and use the exact same isolation transformer you have, and use a power strip out from there for everything, including the variac and sometimes a DBT. I just got one heck of a deal on a brand new Tektronix TBS1104 Digital Oscilloscope: 100MHz, 4 Channels, 1GS/s sample for a mere $600. They sell for over $1900 on most places like Mouser. Santa was good to me. lol! The 4 channel is great when servicing quad amps and receivers. The old analog BK 2120 20MHz scope serves the purpose quite well and will not be "retired" any time soon and will be used on a 2nd bench. The Lab-Volt 1236 AF/RF generator works quite well for audio too. Awesome videos Brother!
@ronaldsantosjapan
2 жыл бұрын
Wonderful info! Exactly everything I was hoping to find out. I will definitely follow all vids in this course. (BTW: Never seen a KZitem video with zero dislikes before. And this has been up for a year with 33K views as of November 2021.)
@jutukka
3 жыл бұрын
Excellent video. Thanks! Happy New Year! 🎇🎆💥 Stay safe. 😷
@trainliker100
2 жыл бұрын
I can add a little info on vintage scopes as I have just done some research and testing for model railroaders who might want an oscilloscope for measuring the "Digital Command Control" voltage but don't want to spend much. (Plus, I have used such scopes in my mercilessly long career.) One thing to remember is that the major manufacturers each had a range, often a very wide range, of oscilloscope models and usually the bottom of the line would be fine for audio. But on the used market, there tends to be far less of a price spread between models and manufacturers than for the original price spread. The Tektronix 465 mentioned (or you might be more likely to find the 465B) was a top line oscilloscope (the industry standard, actually) introduced in 1972 for $1,725 ($11,470 in 2021 dollars) sells on eBay for $100 to $250. A Tektronix 2215 introduced in 1982 for $1.400 ($4,032 in 2021 dollars) sells used for $50 to $150. A Hitachi V-212 introduced in 1983 for $340 ($949 in 2021 dollars) sells used for $50 to $120. Of course, offerings vary in condition a lot, but you can get a very nice vintage scope for so little money that the biggest concern might be the shipping cost and perhaps having to buy some probes. If buying a new digital scope, typical names today for bench scopes are Siglent, Rigol, Hantek, and some others. (I recently got a Siglent SDS1202X-E and think it is rather decent.) KZitem reviews abound on new scopes but beware that some reviews are by some who are not very knowledgeable and some by those with decades of electronics training and experience. While the lowest bandwidth models are adequate for audio, it often doesn't cost very much more to get much more bandwidth and perhaps more features. Frankly, the options today for low cost oscilloscopes made in China can make you feel like a kid in candy store. Some scopes I would NOT recommend are the "mini" DSO's or "Tablet" oscilloscopes. While usable, most wildly exaggerate their bandwidth and can be annoying to use with minimal controls and maximum menus so you are forever cursoring, cursoring, and cursing to make changes. Also, even the lowest end mini-DSO (200 kHz claimed bandwidth, but not really) is about $75 and if you step up to a better model and you are above $100 pretty easily. They just aren't a good value in my view. They are the sort of thing that, if want to use it regularly, you live to regret. They do have the advantage of being battery operated, however, which certainly takes care of isolation issues.
@scramblesthedeathdealer
8 ай бұрын
I want to get into amp repair, pedal repair, modding, building, etc. This video seems very helpful, thank you! 👍
@rayprevailer8454
3 жыл бұрын
Perfect Timing. I am looking to purchase an Oscilloscope for various Guitar amplifier and pedal builds. Looking forward to watching the series....Thank you.
@jamesmdeluca
3 жыл бұрын
Greetings: FYI: As far as I am concerned, all RCA type connectors are to be called "phono" types. They all are single signal (plus shield). They have been around a long time and were originally used to connect the first phonographs with electrical pick-ups to tube radios equipped with a single RCA connector to use the radio's amplifier and speaker to listen to 78 rpm records that had once been played on wind-up gramophones. All tip-ring-sleeve audio connectors owe their heritage to the original plugs used on telephone switchboards, hence "phone" connectors. Although those first phone plugs (and jacks) were three connector types, the audio industry standardized on them for patching including use for balanced signals. My first exposure to tiny plugs/jacks were as earphone jacks on transistor radios. Some were smaller than the common 3.5 mm plugs used today. But all are deserving to be called "phone" plugs. BTW: in Europe RCA phono plugs are often referred to as CINCH plugs as CINCH JONES is/was a major manufactuurer of them. (Plus there was some resentment against the Radio Corporation of America for their tight-fisted use of patents to suppress competing radio makers.) I do not know if RCA ever manufactured their own phono connectors or just used some else's patent ;). Hope this helps. P.S. The original use of the 1/4" stereo headphone jack was an outgrowth of the use of 1/4" monaural headphone jacks on mono hi-fi gear. The use of phono connectors on audio/video gear is likely due to their smaller panel space requirements.
@JohnUsp
3 жыл бұрын
16:45 - I think the Real signal came from the Analog Oscilloscope, because the Digital "sample" the signal, usually 500MSa/s, 1GSa/s, 2GSa/s, etc and this is a "discrete" wave. On the analog scope is a continuous wave.
@ripjones5294
Жыл бұрын
Just found these videos, and I am really enjoying them. Now that I'm retired, I would like to get back into the electronics side of vintage audio. These have helped me get started on my bench. Is there a good "crash course" to get me started in creating my little audio service business ? Back in the day, I sold audio gear in Atlanta, and I built a bunch of Heathkit in my day, including a bunch of the display models at the Atlanta store. Personally, I also built a 25" Color TV kit, that still sits in my garage. Any help/guidance I could get from you would be awesome. Thanks !! Rip
@charleswells9682
3 жыл бұрын
Very good video, sir. I've ended up with several 'scopes ranging from a late 40s lab model through a dual channel Heathkit c.1970 up to a 100 MHz Techtronics. For audio use on my radios I use the Techtronics or another 10 MHz scope (tube equipment) or one of the cheap DSO138 or DSO150 units from eBay/AliExpress/Bangood for solid state equipment (these are roughly $24 - $30). I have used the DSOs fed through a capacitor for some boat anchors. I plan on closely following the remainder of this series. Thanks.
@77-MERC
Жыл бұрын
Excellent tutorial. Answered a lot of my questions. Links very helpful. Thanks
@DIYerGuy
3 жыл бұрын
Excellent beginning! Really looking forward to your coming videos. Just a few observtions on isolation: Your slide that showed some isolation devices was useful, but there was a something that said a Variac is not an isolation device - something you didn't mention or go into at all but I suspect you'll cover in your next video. Since your coverage is scopes for audio bench work may I suggest you consider expanding on the initial 5 topics currently and perhaps cover areas such as harmonic distortion measurment, inter-modulation distortion measurment, etc. As a side note some of the digital scopes can do BODE plots which are great for frequency response (and phase response) analysis of a DUT. Another related area you might want to consider is spectrum analysis where you'll inject a sine of known purity and see what the DUT does to it on its output - this was a common procedure done with audio amps and preamps when the Hirsch-Houk Labs used to be a regular part of Stereo Review magazine back in the days (I'm dating myself). As you mentioned in the video you're looking at a Keysight model for around $1k for your own use. There are also some from Rigol and GW Instek that can do BODE plots. If I'm not mistaken the Rigol requires an external waveform generator where as the Keysight has one built-in to the scope .. I think. However, in particular the GW Instek 2000E/G series MDO (Mixed Domain Oscilloscopes) have a built-in dual-channel Arbitrary Waveform Generator (0.1 hz to 25 MHz) and with free software from Instek for the 2000E/G scopes can perform a BODE plot. The 2000E/G series MDO scopes also have 1 million point (selectable) FFTs - something you don't find on most other low-end and mid-range digital scopes. And as if that weren't enough, the MDO 2000E/G series have a built-in separate Spectrum Analyzer where span, center point, window type, etc. can be dialed in like a stand-along spectrum analyzer. The "E" version of the series also has a 5000 count Digital Meter (and a 5V/1amp power supply if you're into design). For audio work the MDO 2000E/G scopes are a fantastic combination and you might want to include using one of them (they come in 2-Ch and 4-Ch varieties and span a total of 12 models) in one of your future videos. I should mention I am not connected with GW Instek in any way, but I have been looking for a scope to do more than just the usual and after comparing their scopes to some other brands/options the Instek MDO-2000E//G seem to give you quite a bang for your buck, so I purchased their MDO-2104E (100 MHz, 4-Ch) for my audio work. Looking forward to your next videos!
@Jah_Rastafari_ORIG
3 жыл бұрын
Just FYI, at 8:39 you say 20MHz while showing 20kHz. Great video, regardless!
@STBRetired1
3 жыл бұрын
This is the video that pretty well answers my question. I'm retired and setting up my workbench for repairing some old Tektronix 465 scopes and some old Hallicrafter Ham radios. The Service manual for the Tek 465's states that I need a scope to check out the scopes. So, for the same price, would I be better off with one of those Siglent scopes or should I go back to a more basic scope like a Tek TDS 350, TDS 360 or your 2245A scope? I'm suspecting that the Siglent menu driven scope has far more features (complexity) than I'll ever need. I was (long ago) an electronics technician - not an Electrical Engineer. The TDS scopes have the controls layout the same as on the older 465 scopes which would be more familiar to me than the menu driven Siglent scope. One feature I like about the TDS scopes is the turn-on self-tests and the functional tests capability. If I bought one that passes all those tests then I might assume that it would be in good condition, right? I think I'm talking myself into the TDS scopes. Is there anything you could point out that might sway me towards the Siglent? I think your video did a great job of answering that question for me.
@anullhandle
3 жыл бұрын
The rigol 1054z now comes with all the software upgrades enabled out of the box accept the 100 mhz. That is a free simple software key hack available all over the Internet. Don't enable the extra sensitivity upgrade there is a hardware limitation. I love the old tektronix masterpieces but a 350 dollar new hardware 4 channel 50mhz err 100mhz :) scope is tough to ignore.
@JohnUsp
3 жыл бұрын
You can use a BNC male to male 3.5mm cable.
@kostaskritsilas2681
3 жыл бұрын
Good introduction. I too am an analog scope guy. Used 10MHz Philips scopes in college (up in Canada). One of the most overlooked scopes on the market is a Tektronix 2236/2236A. It should be cheaper than your 2246. However, it has a pretty interesting built in frequency counter, and time measurement functionality and multimeter that can be slaved to channel A. I think the frequency counter is 8 digits, and it it a 4-5 digit multimeter, and there are separate inputs for the multimeter if you want to do voltage, resistance, and continuity tests. I think it can also do external frequency tests, but its been a while, so I'm not sure about that. The scope will put meaurement lines on the screen when the multimeter (for measuring Vp-p or Vrms) or frequency/time (just like the 2246 does). Neat part is that the multimeter/frequency counter is slaved to the oscilloscope channel, so the readouts are based on the vertical and horizontal settings on the scope, so no need to do math, or count graduations and then multiply. As far as I know, the frequency/time functions work to the entire bandwidth of the scope (100MHz), as does the multimeter, and I'm pretty sure that the Vrms is True RMS, even to 100Mhz. I bought (leased actually) 25 of these Tektronix 2236s for the computer factory that I used to work at. We were constantly buying Fluke meters, and they would constantly disappear. Because I was working as a test technologist at the time, my boss asked me to find a solution to the "multimeter growing legs and walking away" problem. I looked a locking the meters up, tried it, and they still disappeared. I tried to get people to sign them in and out, and they still disappeared. So, I tooke the remaining multimeters off the production floor, and changed all the scopes out for Tektronix 2236s. No more missing multimeters, and the techs all found the scope's ability to do time/frequency measeurement a great benefit. Reliable, solid, and typical good Tektronix quality at the time (late 1980s to early 1990s). The HP 172X and 174X scopes were great too, as were some of the Philips (anything without the LCDs and non-digital) and Kikusui scopes (COS series). Never used the Hitachi scopes. And by the way, the Tektronix 2465 series, while ridiculously overpriced these days, is probably the greatest portable oscilloscope ever made. I had one on my bench for over 5 years, and it was a joy to use, and a real advance on the previous scopes that went before it.
@bobkraft9029
3 жыл бұрын
Thanks for putting this series together. I’m looking forward to the rest of the videos. Can you comment on input voltage capabilities of analog vs digital scopes. Even with 10x probes, aren’t some of the digital scopes not necessarily ideal for testing tube amps that can carry over 500vdc, plus the analog voltage on top of that? Thanks.
@allthegearnoidea6752
3 жыл бұрын
Your quite right most of the modern scopes are limited in terms of voltage per division as they weren’t designed for use with valve gear etc more for modern digital electronics. I do have some some x100 probes I sometimes break out for valve gear but I don’t often find I need to take direct measurements of anode level Voltages very often.
@Blueglow
3 жыл бұрын
That's planned in the safety video.
@PeterMilanovski
3 жыл бұрын
For basic audio work, there's a cheap Chinese unit that Dave over at EEVBLOG did a review on it, he didn't like, probably wasn't up to what he might have used it for but someone else did a great review on it, I think that it was the learn electronics channel, it's got a built in lithium battery and a 7" screen, has FFT and covers the audio frequency range! Because it's not plugged into the mains, it's isolated and being extremely portable you can use it on your car if the need ever comes. The brand is FNIRSI, has two channels and is touch screen! It does have menus but no where near as much as other scopes! You will find that the touch screen works really well to. But the price for what you get just can't be beat! It's battery is charged by usb and it's battery can be upgraded to something much larger if 4 or 5 hours isn't enough! It's actually built very well and feels very professional! It claims that it can measure really high frequencies but it can't, but for 0hz to 50kz, you will be covered, it can go higher but I only use it for audio, displays voltage and other data along the bottom of the screen which you can pick and choose which data you want and both channels data can be independently chosen! It's not as good or featured as a Rigol but it's almost half the price! For getting started in audio, I think that it's perfect! I also have an older CRT scope which doesn't do any data and I even got one of those tiny little all aluminium cased two channel scopes, it's also great just for audio but it's tiny 2.5 or 3" screen isn't something that you want to be starring at every single day! It's great to drop into your shirt pocket and go for a quick once in a blue moon but definitely not every day! So yeah, I think that the FNIRSI is definitely worth it if it's in your price range and you are only working with audio! If this unit becomes popular, I'm sure that the next model will have improved performance and features! I love it ❤️. I got mine from eBay but it should be also available on Amazon to... Check it out!
@kevinhamming4514
2 жыл бұрын
Since I'm a tube roller guess I'll comment. First of all love your channel thanks for all the info. I just won't work on the amp when it's plugged in. I power the amp down, move my connection, then power it back up. Takes longer but it's a safety step I won't skip often. Also people with isolation transformers need to know they can't use test instruments that way and they are grounded if nearby. Which means also you could touch the ground on the oscilloscope lead when you hook it up to your amp. It takes very little current supposedly to kill a person. Having the amp turned off when moving your connection isn't ever mentioned. The 1 hand rule is impractical. You eventually will inadvertantly have 2 hands in your amp. You can see powering the amp down doesn't take that long. If Working on it powered up MUST wear insulating gloves such as latex, and only one hand if possible.
@aerofart
3 жыл бұрын
A common unit value to express frequency in the past used to be CPS (Cycles Per Second). It has since been superseded by Hz
@scottjamable
3 жыл бұрын
Mark I am mainly interested in testing guitar tube amplifiers, I inherited two vintage tektronixs scopes. 466 storage scope and a 453. The 466 has a nicer bigger display but it is a storage scope, Is this good for trouble shooting amplifiers? Thanks for all of your hard work.
@kyfeam
Жыл бұрын
Wow bud.. really appreciate you making these.. thumbs up for sure..
@baruchben-david4196
3 жыл бұрын
Wouldn't it be the X axis is time, Y axis amplitude/voltage?
@Blueglow
3 жыл бұрын
Indeed, simple video typo (via mouth)
@williamcolvin3609
3 жыл бұрын
When testing on HF Radio Receivers - what equipment would be needed for Audio Repair on the Receive section of a HF Transceiver 26 - 30Mhz?
@fuccasound3897
3 жыл бұрын
I own a Yamaha CS30 synth and have been looking for advice on oscilloscope buying just to check waveforms etc. pleased to find this.
@ericfetsch1586
3 жыл бұрын
I can't thank you enough for this video! I can't wait for the rest of them!!!
@steinerikhanssen
2 жыл бұрын
Thank you for a great video 😊
@remco613
3 жыл бұрын
Hello from Holland. Thank you so much for all these great video's, I'm very grateful for them. I have 2 questions. I have my eye on a secondhand Iwatsu analog oscilloscope, would you recommend this for a beginner? And concerning the function generator, I have an audio recording setup, will a sine wave from a laptop through an audio interface be enough to test guitar amplifiers and guitar effects?
@thevinylguy6823
3 жыл бұрын
Thanks for this! I’ve been hunting a video like this for sometime. I recently bought a Tektronix 2232 for $100. Good price for that unit?
@TheGreatTomDix
9 ай бұрын
Just get a tone generator on your computer man!
@dell177
3 жыл бұрын
i used a tek 545 for years and it was a great 33mhz scope with interchangable vertical plugins. In the late 80's that was getting dodgy so I replaced that with 35mhz dual trace Hitachi scope, it was functinality similar to the old 545 and easy to use. The 545 is long gone, the Hitachi is still working great. I 2011 I got a good deal on a Tek 2230 storage scope that is a 100mhz analog scope with a digital overlay and waveform storage. I used a scope like this for years in my real job so i was very familiar with it. I can now display 4 channels on the odd chance i need to do that by using both scopes but that almost never happens. The digital capture comes in handy if your going through parts trying to select something with known risetimes. The modern digital bench scopes are interesting but you should be able to find a good analog scope for a good price and as a bonus you can probably fix it yousrself, if a new digital scope dies it has to go back to be fixed and will be gone for weeks or months and cost a lot to repair. As to the ability to display measured values on the screen i find i can do the math in my head faster than what it takes to set up the fancy scopes.
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