Not only is this guy an absolute genius, but he's also one of the most entertaining personalities on the web! We have more than 150 channels available on our cable TV, but I'd rather watch this guy any day. Thanks, Ron !!
@Dutchamp
3 жыл бұрын
Your right never seen a Glassinger who makes his own tubes.
@brotherspock8180
4 жыл бұрын
Logic would dictate Glasslinger to be categorized as a national treasure.
@markbuxton2368
4 жыл бұрын
6:47 Who needs Netflix when Ron is in full flow! Great stuff, thanks so much for taking the time to make these videos
@shamrock1961
4 жыл бұрын
I like it when you are in teacher mode in your videos. But its always nice to have new videos from you. Its going to with Ron. Thanks for sharing your knowledge with us.
@johnkelsey5016
4 жыл бұрын
I know that Grommes Little Jewel 10 watt amplifier personally. It was assembled in 1950 by my 14-year-old brother. It worked very nicely for a number of years. I have no idea who did the "hack" but I'm very sure that it was not done by my brother who was a fanatical perfectionist. Thanks so much for bringing it back to life, harmonics and all!
@jimdavis6833
4 жыл бұрын
In electronics, it's called a "mod", not a hack.
@nevillegoddard4966
2 жыл бұрын
Wow cool John what a small world to find the amp your bro built being resurrected on yt!
@Chris_Grossman
4 жыл бұрын
Your spectrum analyzer was indicting an overload when you saw the high distortion. There is a high probability that was the cause of your high distortion readings.
@malekdavarpanah4925
2 жыл бұрын
Thank you again & again you have no idea how much we enjoy your videos and your Beautiful ways to approach toward the problems. 73 My Friend Malek KI7DYM
@scharkalvin
4 жыл бұрын
With 6v6gt tubes that's about a 10-15 watt amplifier. Probably between class A and full AB1, so maybe 50% efficiency, 30 watts. Add 20 watts for filaments, that's 50 watts total. Transfromers should be at least 90% efficient, so a 50 watt transformer should lose about 5 watts. I'd say that 5 watts in the transformer is OK, but at the high end of what I'd expect. As Shango66 has often demonstrated, you CAN often 'repair' noisy pots by cleaning them with de-oxide. Always good to try anyway, as it's easier to clean them than replace them. Linear pots are easier to diagnose with a meter than log pots. Also many digital meters have an 'analog' bar graph for this purpose! At least my fluke does. The reduction in size of modern capacitors reminds me of a scene from the movie 'This Island Earth'. Put the ohmeter on the voice coil!!
@AliasUndercover
4 жыл бұрын
Ha! Half of the electronics I see nowadays reminds me of that movie. Plus an interociter seems kind of easy after working on stereo equipment from the '80s.
@anandarochisha
3 жыл бұрын
I searched for years for a Triplett 630 Anyways, finally got my used meter in the mail the other day. Everything Works ! I am thrilled..was going to go for a Simpson 260, but glasslinger changed my mind.
@yardleybottles6025
4 жыл бұрын
Great to see you back again! These videos are pure excellence, and you are greatly appreciated!!!
@johnperry5396
4 жыл бұрын
Stuck in quarantine, this site is a lifesaver. How many skills can one become expert in?
@TheGuitologist
2 жыл бұрын
I converted almost the exact same amp to a guitar amp on my channel. As a guitarist, we love the distortion. This little amp makes a great guitar amp. That's likely why the RIAA circuitry was ripped out of yours originally.
@nevillegoddard4966
2 жыл бұрын
Aha Brad I thought it might sound pretty good as a guitar amp!
@johnsampson1096
3 жыл бұрын
Thanks for the tutorial on the spectrum analyzer, Ron. Loved the comment on replacing 80 capacitors in a tv set quickly to make a living.
@Latuernich09
4 жыл бұрын
Love your cycle controlled electronic fuse box!!! Cup of cherries this time.
@JamesBakerOhio
4 жыл бұрын
The instruction and knowledge you share in your videos is golden, thank you for so many ah ha! moments, you are a wonderful source of inspiration and entertainment for us aspiring repair techs
@Theoobovril
4 жыл бұрын
That was a fun video, Ron, especially when you managed to pop that speaker..he-he. That event was water off a duck's back to you...just pop in to the attic and find another speaker, "No problem"...The rest of us here watching would have cursed this event and slung that speaker across the lab in annoyance and frustration, but not you, Ron, he-he.
@glasslinger
4 жыл бұрын
The cursing and throwing I edited out of the video! :)
@Theoobovril
4 жыл бұрын
@@glasslinger I couldn't possibly believe that, Ron..he-he.
@simonowen488
Жыл бұрын
Ron, you are the everything-teacher I never knew I always wished I had.
@joohop
4 жыл бұрын
Brilliant Work Earthling Bless Up
@priestblood
4 жыл бұрын
Am always happy when I see you have released a new Video ,Thanks Ron I truly appreciate your time and skill you teach and show the world these fantastic vintage radios.
@DonaldVanHall
4 жыл бұрын
I like watching someone with experience and a Weller Gun. Nice job.
@drtidrow
4 жыл бұрын
About the only time I break out my soldering gun is when I need to make a ground connection to the chassis, otherwise I use a temp-controlled iron.
@canwejustdie2252
4 жыл бұрын
Why I am watching this? Why this was recommend to me? I don't even know what this guy is doing on this video 10/10 keep going man, you doing great
@Dutchamp
3 жыл бұрын
If you don't understand electronics I can imagine. Cheers there is a lot of other videos that you gona like.
@timmack2415
3 жыл бұрын
Hey, Ron. I just found your videos and an enjoying them. I worked in a TV repair shop (remember them?) during college. I restore radios as a hobby for the last 30 years. We're a dying breed... And brake cleaner is a new one to me
@deadfreightwest5956
4 жыл бұрын
I remember Quietrol. That stuff was (allegedly) mainly carbon tetrachloride (early dry-cleaning solvent) with a dash of light oil, dye (it was red, like cranberry juice) and maybe a fragrance, too. Sure worked a treat.
@goodun2974
4 жыл бұрын
I still have some Quie-trol! Doesn't smell like Carbon Tet (got a bottle of that too), though any original solvent may have evaporated.
@montygore1200
Жыл бұрын
Hello young man. I have really enjoyed this video. I think you and I are pretty close in age. I have not had a lot of experience in audio equipment. My field has been in rf but our old principles are the same. These new techs have really missed out on using the old test gear. I loved watching you use that old equipment that some you probably built yourself. Glad to see you put in the notice about using break clean and getting it on the plastic dials. I learned this the hard way onsome old transmitters that parts are hard to find. Keep it up as long as you can. As I aged my hands shake uncontrollably and I have retired. I miss it so bad. God Bless you.
@thermionicrectifier747
4 жыл бұрын
Interesting as always. I was wondering if you could try building a magic eye tube sometime.
@MrPhantomFury
4 жыл бұрын
Wow that would be just fantastic ! I recently watched his miniature vacuum tube triode video once again & boy I love it ! If he could make a video like that making a magic eye tube sumhow in HD with his new camera, that’ll be just fantabulous ! :D He’s a master of all trades haha :D
@geofftaylor8913
4 жыл бұрын
Me too. Great idea!
@linorocha6319
4 жыл бұрын
Or at least try to bring back to life a faded one!!
@BastiElektronik
4 жыл бұрын
That'd be great. Maybe playin' with different phosphor colors!!
@rfburns5601
4 жыл бұрын
That would be cool! She should do that.
@markbuxton2368
4 жыл бұрын
blown away by the depth of your knowledge
@fernandobarbi4298
4 жыл бұрын
Hahaha, man! I´ve never enjoyed so much a tube repair video like this one! Your laugh and your sense of teaching is awesome. Thanks and cheers from Argentina!
@gsetful
4 жыл бұрын
very interesting, especially the distortion measurement part... Good Job, as always.
@goodun2974
4 жыл бұрын
I had one of these Grommes amps, and a Pilot tuner, sitting atop the fridge in a house I had rented with a group of friends. Sounded good on FM through a Lafayette speaker, and occasionally we'd play guitar through it (lots of distortion). This was back in the late 70s.....
@barthanes1
4 жыл бұрын
Your electronic wizardry is astonishing to watch.
@unsearchablethings8167
4 жыл бұрын
You’re a genius. I’m an EE myself, and you are a master of many trades. Glad your video showed up in my feed, and subscribed. Keep the videos coming.
@KeritechElectronics
2 жыл бұрын
"Had another one at the attic" ha, that was a masterpiece! To think that it was the speaker that was causing problems... I really enjoyed this restoration. Truth be told, the status quo ante stroke me as really modern and far from original. As if someone's been there, maybe even in this century.
@GeorgeWMays
4 жыл бұрын
Love the video. Much appreciated. Why do I imagine that the attic looks like the government warehouse in the Indiana Jones movies?
@BenPrevo
4 жыл бұрын
Garage...
@JustinMF11
4 жыл бұрын
Bill Gates.
@MrPetrabella
4 жыл бұрын
Good advices on soldering old stuff at 19:30 ! Not wasting time with wrapping wire before soldering, a small wire hook is sufficient! Please continue your practical video collection. I admire your deep experience and insight in glasstechnology , electron devices and restoring old gear. Thank you!
@docholliday3150
4 жыл бұрын
Always interesting to see your approach and methods. Nice work as usual.
@srduke
3 жыл бұрын
I find pre PCB electronics absolutely fascinating. Keep the videos coming Ron.
@OverUnity7734
4 жыл бұрын
4:01 I like how the leak detector has an analog meter, LED read out, and an LCD read out . :)
@gunnark9823
4 жыл бұрын
Very good video. This remembers me of my old amp. Many years ago I have bought an used tube amp, it was 100W, and made really clean sound. But I have never take a real look on the solderings. I should have done that because it blows up the output transformer as a bad soldering give up after some time and full current goes through (pentode..) and even worse, someone before me had increased the fuse amp ratings... So bad! So my advice, take a look at all solderings carefully before switch on any amp.
@phonotical
4 жыл бұрын
I have never known a capacitor to be "reformed", throw the fucker out and dont be lazy haha
@Joemama555
4 жыл бұрын
Tetrachloroethylene is the brake cleaner / dry cleaning fluid. from wiki: "Chlorinated brake cleaner containing tetrachloroethylene will on exposure to high temperatures (above 500 °F (260 °C)) or strong UV light decompose into phosgene and hydrogen chloride, both of which are dangerous when inhaled." so no spray on hot metal!!!
@mikeburgess7331
4 жыл бұрын
Thanks Ron for another great video! Please keep them coming, particularly the glass blowing videos!
@Zero_Ego
4 жыл бұрын
Wow, now that's a pro tip - using CRC Brake Cleaner for the POTS. Personally I have found some so called cleaners leave the POTS all full of goo and sticky. Potentially makes them worse. Thanks for the tip.
@josephconsoli4128
4 жыл бұрын
Nice work Ron. Another good vid.
@andywander
3 жыл бұрын
Thanks, Ron!
@VarnHomestead
4 жыл бұрын
Just found your channel.. I love old electronics and am getting back into this stuff.
@Super8Rescue
4 жыл бұрын
what a treat, thanks for the video
@gordonwelcher9598
3 жыл бұрын
The scope is displaying "Overload" when you increase the signal. Maybe that is why the harmonic levels indicated are so high. Try to adjust the scope so the signal does not go overscale in scope mode.
@juniorocicat9573
4 жыл бұрын
You are over driving the spectrum analyser.....
@allthegearnoidea6752
4 жыл бұрын
Junior Ocicat your right. Modulation products.
@JulesB-zv9dp
4 жыл бұрын
Love this video, thanks for sharing 🙂👍
@pibbles-a-plenty1105
4 жыл бұрын
Having resurected 50 year old stuff for the last 50 years I've only had to replace nor more than 10-20% of them. What you need to determine is if a capacitor is close to the end of its life. Reforming a worn out capacitor is a waste of time and effort. Reforming a capacitor that has lots of life left SAVES time and effort. What to know is if a capacitor is good and will reform and provide many more hours of service. That determination is made by combining a condition test with reforming. NEVER assume a capacitor is good for any reason. A bad cap is a bad cap as a good one is a good one. If the capacitor reforms according to the current change versus time and applied voltage for a good capacitor, it's a good capacitor and can be left in the circuit. Why safe any capacitor? Because the in most cases the originals are no longer available and the time and effort to make a proper job of replacing with alternate types can be the undoing of a decent piece of equipment. But in retrospect, it's all throw away junk anyway.
@helmutheller1538
4 жыл бұрын
Would be interesting to see the curve shape (oscillogram, time domain) of the output voltage. Does the distortion come from the change-over of the push/pull output stage, or does it come in at the peaks of the voltage (maybe sagging power supply?), or does it come from the phase inverter, or.... I love your videos, Ron, keep them coming!
@rfburns5601
4 жыл бұрын
She's overdriving the spectrum analyzer.........look @ 45:14............display sez overload.
@Wimpzilla
4 жыл бұрын
Dunno why the equ got removed, but it was damn funny. Awesome troubleshooting, thank you for sharing. Stay safe, much love. ❤️❤️❤️
@fredfabris7187
4 жыл бұрын
I agree with you........ you hear a lot of KZitemrs go on and on about how you shouldn’t “J hook” parts in. That’s fine if it’s yours and it’s a hobby or if it’s a truly rare and valuable piece of equipment. A customer is not going to be happy paying 8 hours of labor to fix a $500 amplifier. If done correctly, it’s just as reliable.
@ronbax2922
4 жыл бұрын
If you remember the old "No Noise" spray, used to quiet noisy volume controls, a few years ago, in a bind, I tried some WD-40. It worked beautifully.
@hi-friaudioman
4 жыл бұрын
I love that laugh. "Four capacitors? Hahahahaha, I remember that TV, there were like eighty." Amen to that.
@sr633
4 жыл бұрын
I thought it looked like a 10 watt output amp. We had two of these at our Motel. One for PA address and one hooked to an FM tuner.
@moodyga40
4 жыл бұрын
love your videos keep them coming
@xnavynuc
4 жыл бұрын
Someone’s probably already commented on this, but putting a square wave through a speaker is almost a sure way to blow it out even at low power. That ramp up on the start of the square wave draws a huge amount of current. By the way, this was one of the most entertaining videos I’ve seen in a long time! Good job!
@glasslinger
4 жыл бұрын
Also turning up the volume on the amp and then slamming your fingers across the guitar strings! The inductance of the speaker will block the sqaure wave harmonics. If your speaker blew out due to "square waves" you simply got a junk speaker!
@xnavynuc
4 жыл бұрын
glasslinger Excellent point! Thanks.
@TestTubeBabySpy
4 жыл бұрын
@@glasslinger Yes, I have a MOOG analog synthesizer and blast square waves through my speakers all the time.
@nevillegoddard4966
2 жыл бұрын
@@TestTubeBabySpy You got a Moog? Awesome! Hopefully you have heard "Switched on Bach" by Wendy Carlos? What an amazing piece of work - on a Moog synth!
@TestTubeBabySpy
2 жыл бұрын
@@nevillegoddard4966 Yes I am familiar with some of her music.
@rfburns5601
4 жыл бұрын
That amp should easily produce 10 watts into a resistive load at 1% or less distortion. It doesn't look like you turned down the input to the spectrum analyzer as you cranked up the amp. The display shows overload!
@Mikexception
4 жыл бұрын
Data sheet says always separately: harmonic distortion and max power. They did not mention max power is at given above distortion, - it probably is at max distortion. And for 6L6 "max" power is 11,5 W which means it may be 50% THD. It meets my practice never reach more tam half of nominal power. . Who wants more pls be open to solid state.
@nevillegoddard4966
2 жыл бұрын
@@Mikexception Hi Mike. Valve amps usually produce mostly even harmonic distortion, especially single-ended triode output amps. Push-pull pentodes less so, with more odd harmonics. Even harmonics sound much 'sweeter' & 'warmer' than odd harmonics. I think Ron already said that the output transformer was poorly matched to the circuit. This may account for the apparently high even & odd distortion from this amp. But distortion is distortion Mike, even or odd. Maybe you don't ANY distortion at all which is fair enough, & a good reason why you seem to prefer transistor amps. Usually much higher power output for far less cost, weight, distortion & power input.
@drdyna
2 жыл бұрын
I love how you end your videos "okay, that's it." *click*
@triodehexode
4 жыл бұрын
You would not have blown the speaker if Supervisor Kitty was there to keep you right😺
@scratchback2001
4 жыл бұрын
These videos make my day! As a gay Aussie guy I just love them and what's wrong with valve amps? My Primaluna Dialogue Premium HP Integrated Amplifier running EL34 output valves sound excellent so there! LOL
@ronrodgers6531
4 жыл бұрын
I have always used some type of cleaner-lubricant. Back in the day was tv tuner cleaner. Recent years I have used a couple varieties of Caig De-Oxit. Any reason or advantage using CRC Brake parts cleaner? No residue? Grease-cleaning capability? Cost?
@anderskarlsson9881
4 жыл бұрын
The reason for using it is that it evaporates fast and leave no residue. Never use anything with lubricants on any contact surfaces. The lubricant will gather dust and just make it worse. The best is always mechanical cleaning, and the second best is chemical cleaning that leaves a clean and dry surface.
@gwcoty0715
3 жыл бұрын
Crc is way cheaper and works just as good. Evaporated quicker too.
@ButtonsKing
4 жыл бұрын
Hi, at 43:48 and also several times later the analyzer displays OVERLOAD at the lower right corner. The spectrum does not change much when the voltage increases above that level. I expect the analyzer input is saturated and the spectrum shown is incorrect.
@glasslinger
4 жыл бұрын
Yes! (blunder) I was in a hurry to get the video finished and wasn't paying good attention. Anyway, the distortion was near 10% before the analyzer saturated.
@tamaram.8662
4 жыл бұрын
I was watching till the end, hoping you would realize putting 8V into the analyzer set to 0dBV full scale is causing the distortion.... The analyzer even says "OVERLOAD" in the bottom right corner ;)
@andrewpike2924
4 жыл бұрын
I totally agree. The test is invalid, the input of the analyzer is distorting due it being too sensitive.
@glasslinger
4 жыл бұрын
OOPS! It was an oversight since I was trying to get the video done in 45 minutes. The distortion was still present while the signal was within the scale of the analyzer. Actually, it was surprising at how little distortion was added by the analyzer front end overload!
@tamaram.8662
4 жыл бұрын
@@glasslinger this is not true. Any time the Analyzer displays OVERLOAD, the "harmonics" go up significantly. The way such analyzers work, this is not at all unexpected. The input signal either goes to an A/D converter with little headroom for overload and the digital data is subjected to an FFT, or, if its an older model, is mixed up to a higher frequency and subjected to a tuneable filter. Both variants will produce harmonics when overloaded.
@ctbcubed
4 жыл бұрын
The output tubes bias should have been checked before any testing. Then display the amplifier output sinewave on a scope to see the point at which it begins to distort. This amp should be fairly good up to the limits of the output tubes. After checking to see at what voltage the amplifier begins to distort, I would back off slightly and use that level to set the analyzer to -10dB. Then look at the distortion products as the amp output is increased toward 0dB and below -10dB on the analyzer while measuring the output power at those points.
@nevillegoddard4966
2 жыл бұрын
@@ctbcubed Hi mate! Yeah I dunno mate; it looked to me like the harmonics were steadily rising as the output power was increased, from even just 2V output! Truly, it could never be a hifi amp, but maybe a good guitar amp?
@markpompi6349
4 жыл бұрын
This is a very good video, the suspense never ends! Very educational and enjoyable. You are awesome. By the way I'm only 3/4 through it. It must be hard repairing a kit that was made wrong from the beginning
@markpompi6349
4 жыл бұрын
Just before the amp started motorboating, you used your clothes to clean out the tube holder. I know that's totally unrelated , but I think you're so awesome. I paused video and I can't wait to see what's coming next. I think you're great!
@tipfox9212
2 жыл бұрын
I recon they removed the RIAA because they wanted to play the guitar over it - and that's what killed the "HiFi" speaker , too. Was there :-) Although it's unusual that the sub died - but you can kill ANY big Hifi-box with a guitar. At least the tweeters will blow up... In normal (music) signals there will only be little energy in the hights (about 10..15%). The guitar gives them a 100% ...
@celsoneves2368
3 жыл бұрын
Top show!.
@rjy8960
4 жыл бұрын
Ron - forgive me if I'm wrong, but when you are doing the 1kHz distortion test, you increased the output level from the amp but you didn't drop the input sensitivity from 10dB/div so the 1kHz will be way off scale.
@glasslinger
4 жыл бұрын
It's a log scale so it still fit fine on the screen. This was a quick rough test so I was not carefully setting everything perfect. Nobody would ever use an amp like this for any serious audio reproduction!
@anandarochisha
4 жыл бұрын
I would pay for a guided tour of your attic.
@geofftaylor8913
4 жыл бұрын
Dan Seven me too!!
@fredfabris7187
4 жыл бұрын
That’s what she said😂
@albinklein7680
4 жыл бұрын
Count me in!
@docfoot316
4 жыл бұрын
Well done there ,yes was wondering where kitty was ,must be ur summer time there ,over here in new zealand its winter with frosty mornings .Enjoyed many thanks.
@RuneTheFirst
4 жыл бұрын
That's from the 70s? Looks more like 50s from the components, especially that function switch. (Which looks like it is from the 30s -40s but could still be found later.)
@macrolog
4 жыл бұрын
great video as always
@CrazyLabs
4 жыл бұрын
This channel is amazing!!!!!
@rotwang83
4 жыл бұрын
Quite a lot of even harmonics for a push-pull amplifier. Is there something else wrong, maybe the phase inverter?
@batman387
4 жыл бұрын
Glad to see you. Great video. Hi to Miss Kitty 🙂
@conundrum112
4 жыл бұрын
Hi Ron, love your channel.
@hectorpascal
3 жыл бұрын
Are you REALLY sure you're not overdriving that spectrum analyser, Ron? I'd like to see the sine wave on a scope. You can easily SEE >10% distortion.
@glasslinger
3 жыл бұрын
I didn't catch the overdrive until the final edit of the video. Oh well.
@theoldbigmoose
4 жыл бұрын
Ron I built your electronic circuit breaker, and it is working perfectly! Are you willing to share any insight on the current limited high voltage supply that you built into the Tektronix Rack? For info, it looks like Ron is using a HP 3582A 0-25kHz Audio Spectrum Analyzer.
@glasslinger
4 жыл бұрын
Unfortunately, the power supply uses a surplus high voltage inverter that is not available, so any info would be useless.
@alanhoggard4554
4 жыл бұрын
That would make a killer guitar amp.
@roylarsen7417
4 жыл бұрын
no
@elwoodblue977
4 жыл бұрын
@@roylarsen7417 yes
@ianliston-smith7921
3 жыл бұрын
Fascinating. When watching a sine wave on an oscilloscope (and not a spectrum analyser), at what percentage distortion does it start to become *just* visible? Thanks.
@glasslinger
3 жыл бұрын
Depends on the type of distortion. Crossover distortion 2% or so, harmonic distortion around 5%. A scope wave form is not ideal to determine distortion other than really bad levels. A half percent is clearly detectable in listening but invisible on a scope.
@ianliston-smith7921
3 жыл бұрын
@@glasslinger Thank you. It's also easier of course to hear distortion at lower frequencies as the harmonics are more likely to be in the middle of the audible hearing range.
@pmblsmft2
4 жыл бұрын
Is your electronic fuse homemade? Can you post a schematic? or if it is manufactured can you provide make and model? I could really use one of those.
@ray_mck
4 жыл бұрын
Ron's building video is already on the channel, titled "BUILD AN ELECTRONIC CIRCUIT BREAKER." kzitem.info/news/bejne/tKF5s5t9roOZjIo
@Zero_Ego
4 жыл бұрын
Hi Ron love your channel. I'm a new subscriber. Can I please request that you list the model of the gear you are restoring. I had to take a freeze the video on this one and it seems to be a Grommes LJ-3 Tube Amp. The last TV restoration you never even mention the model. Some of us like to follow along with the schematics which helps learning. Much appreciated. Hello from Australia.
@tommyn.j3628
4 жыл бұрын
Ron on the road again 👍👍
@vtjmproductionsusa2390
Жыл бұрын
You are AMAZING! I love it Thank you so much for this fantastic channel.👍
@Coalrollinfurry
4 жыл бұрын
If i could have chosen an elmer, this would be the one.
@boonedockjourneyman7979
4 жыл бұрын
I think I saw a TM506 go by next to your current limiting device. It would be interesting to see a video about that. I also think I saw a custom plug in. Are you sitting on some treasure there?
@phonotical
4 жыл бұрын
heyyyyyyyyyy, this isnt UncleDoug :D
@geofftaylor8913
4 жыл бұрын
Phonotical ha ha ha
@adenihil
4 жыл бұрын
Ron anb Uncle Doug are my two favorite channels [ about old-school electronics ]... Two very different styles, two approach, both very interesting and mindblowing skillset!!!
@claesmansson9070
4 жыл бұрын
Mr.Carlsons lab ok too,,,,
@deadfreightwest5956
4 жыл бұрын
47:15 - Yes, but it's _harmonic_ distortion, not that solid-state noise, hah.
@garyk.8674
4 жыл бұрын
Thank you for what you do.
@MrRobbyvent
4 жыл бұрын
What always surprises me in this kind of old devices is letting to run hundreds of volts through all this hanging wires and components with no isolation between them.
@Mikexception
4 жыл бұрын
Science is power
@fredfabris7187
4 жыл бұрын
Isn’t it fantastic!!😂
@rafi6424
4 жыл бұрын
OH GOD thats something I always wanted to see done by you :D
@dondesnoo1771
4 жыл бұрын
Had a pa .amp had 4. 6l6 did that the paper speaker cone caught fire when I was a kid .🤗
Just found your channel, love these videos! Keep them coming :D
@robertcrawford7052
4 жыл бұрын
I couldn't really what the THD was from your demo. That amp with feedback should put out at least 10 clean watts with no more than 1-3% THD. But I am used to my old Fisher amps which have a really low THD and wide bandwidth (80kHz). Anyway, thanks as always for the interesting videos!
@rfburns5601
4 жыл бұрын
She didn't attenuate input to the spectrum analyzer............note @ 45:14 analyzer display says overload. She's overdriving the front end of the spectrum analyzer...........that's where the distortion is.
@Mikexception
4 жыл бұрын
How do you know this at least 10watts ( it may be 35W?) and why you do not know it should be 1% or 3%?
@scharkalvin
3 жыл бұрын
It's been awhile since I've heard a tube thingy motorboat.
@drtidrow
4 жыл бұрын
16:45 At least in older equipment, resistors can drift in value quite a bit. I pulled several out of an old Heathkit condenser tester that were over half again as much as what their bands said they were. Gotta test them all.
@fredschumacher1739
4 жыл бұрын
Audiophiles love tube amps for their harmonics. Warmer sound. Transistor amps sound cold.
@Doctom91
4 жыл бұрын
Yeah, no.
@deanagoes2791
4 жыл бұрын
Not always..
@Mikexception
4 жыл бұрын
"Warmer", Colder" is just simplified description of complicated observations.I solved this problems to roots but I am not willing to teach everybody because there is so much other things deeper affecting timbre which they do not know how to rectify. . It is useless to tear myself on something hardest to change.while thousands try to fool audiophiles with second harmonics and "good" distortions which they say likes brain. One who could listen to my old tubes and my speakers will understand what likes brain - it is something else.
@nevillegoddard4966
2 жыл бұрын
Yeah I dunno about that Fred! Some audiophiles hate ANY kind of distortion, whether it's even or not! I'm not sure how much IM (intermodulation distortion) valve amps generate? Might that be a function of their design? I'm not sure, but apparently no one likes IM distortion.
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