I know! My wife couldn't wrap her head around why i enjoy these so much, then she started loving to listen to him and she is not even a musician! I also steal many of his "Uncleisms"! One of my faves: we have wires hanging like a dis-embowled Antelope!😄
Uncle Doug is my favorite amp repair guy. His knowledge is very good and his attitude is the best. It is no wonder that people send him so many gifts. He is a wonderful human being. The world could use several billion people of his demeanor. The work displayed in this clip is highly commendable. Pretty much the norm for Uncle Doug.
A few comments on the video: 1.) I say "6V6" instead of "6L6" at 1:11:20. 2.) Thanks to Robert Set for the opening musical montage and logo. 3.) We tried jumpering Ch. 1 & Ch.2 for the audio demo, but for some reason it did not record well. 4.) It should be noted that Jim Marshall himself did not actually build the amps.....this task was done by Dudley Craven and Ken Bran.
Uncle Doug getting a new video out means to stop anything, grab some tea or coffe and getting into yet another great repairing session with great humor :) I will need to get one of these Marshalls, some day...
Check out the new Marshall Studio amps... while they are PCB instead of hand wired, their build quality is outstanding. Fact is, Marshall could teach Fender (and others) a thing or two about amp design.
Stop anything and grab some tea to watch ? André, do you have a spycam in my living room that I'm not aware of ? 🤔 I was supposed to start working, but got « distracted » by Doug's entertaining offering 😂
Wow that tip on stopping the high frequency oscillation was absolutely fantastic. I really appreciate that. Thank you so much, I will store that in the old memory banks. Great stuff.
I'm just a guitar player. No electrical knowledge before finding your series of videos. I am always fascinated watching you work and explain all of the dark voodoo magic of electronics. Your attention to detail (respectful reverence?) towards this 66 JTM45 was awe-inspiring! I hit the thumbs up while wishing there was a guy standing on his chair applauding wildly I could trigger to let you know how much I appreciate your desire to always go above and beyond! Cherry custom shop work!
I love amps, but I'm not an electronics guy. 90% of the time I have no idea what UD is talking about, but these videos are so calming and stangely hypnotic...like watching Bob Ross paint.
Superb video Uncle Doug. Some very innovative cosmetic enhancements with the capacitors that preserve the visual integrity of the amp. So much so that I consider the film to be worthy of mention and inclusion into the Smithsonian archives. We took these amps for granted many years ago here in the UK, so nice to see yourself and others appreciating and maintaining what you rightly describe as 'Jewels'
Congratulations Doug on achieving your 100,000 subscribers -you thoroughly deserve it. The knowledge and the humour with which you pass on that knowledge makes every video a treat. Thank you for all of the effort that you put into each video. Thought that you might like to know that our new puppy - Penny is totally settled in and is proving to be a fantastic little character. She has brought a smile back to our faces after all of the health issues that I have and continue to have. Take care and it’s great to see you and your animal family back.
I can't tell you how much I appreciate your tuition, passion, love, care and respect for the craft. You truly are an inspiration and my favourite educator in this field by far. The efforts you go to to bring us these videos and the knowledge passed on during them are truly appreciated. Thank you, really. Best, Scott.
Watching this makes me want to build a 45. In 1970 I bought a Marshall Major 200 watt full stack , talk about a wall of sound. Thanks for the video great as always.
I think it was Ken Fischer (Trainwreck Amps), formerly of Ampeg, who said he put Mullard KT88s in a Marshall Major and "sailed past the 300 watt mark".
To be honest with you, I have never opened up an amplifier, however I love electronics and watch as many videos about different aspects of the subject as I can. I do love your videos because of the way you go into what is happening in a circuit and how each component can have such a drastic effect on the overall operation of the unit. Thanks a million for being one of my instructors, it's like being back in college once more, except instead of law, I am learning electronics!
Hi, I really enjoy your videos for many years. I wish I lived in Texas to talk you into letting me apprentice with you. I could learn more than I do from your videos alone. Thank you for your teachings. I've learned so much from you.
Uncle Doug, love the channel, your attention to aesthetics and electrical precision makes it “must-see TV”! Congratulations on reaching 100K subscribers! Next goal is 250K. We’re all pulling for you!!!
Excellent. The beauty of the current limiter is that it allows different bulbs to be installed so one can change the wattage limit drawn by the circuit. Super work Doug thank you.
Another fine amp repair video from Uncle Doug! Two landmark amps, a JTM 45 & a Super Rvb! So much to be learned from your electronix expertise. --> Thank you for your candor 😉
I was lucky enough to own a '64 or '65 variant of this amp between 1969 and 1974 here in the UK. It had the Marshall name in a solid Perspex plate, and the knobs were the larger variety with brushed aluminium faces. Other than that, the amp here seems pretty much identical, with the weighty transformers and the KT 66s. I loved that amp, but it had a chequered history. I once loaned it to a pal, who forgot to connect the speaker cab and promptly burned out the output transformer. Then I had it stolen - twice! The first time it was recovered thanks to a diligent police detective and a pretty stupid thief. The second time, it was lifted from the band's van, and that was the last I saw of it. So thanks for the memories, Uncle Doug! Always love it when a new video appears.
I see super amp tech has been here. A sad, lonely down vote. I have a dilemma now, because I am not super motivated to work on a Friday before a holiday weekend and Uncle Doug drops some amp goodness on us. I think a long lunch is in order.
With the JTM 45 amp all dressed up working great, new tubes I hear why the P-90’s are so sought after. So perfect sound out of them from bass, mids, trebles just cloud like greatness out of them. Totally equal in volume. ❤❤❤❤. I started watching your channel some time ago. This rebuild I heard a smooth transition right in everyway. I thank you so much for all the lessons.
You're so good UD, I'm not going anywhere anytime soon. I can only see your channel grow and grow. Heck, you made me go from "hmm what, let's watch this simple thing again" to "caps are bad" and "thank God for the current limiter" before you've said it. I know your teaching works, because it works. And your ethics are second to none. You are an inspiration and a great place to take knowledge as far as needed: all the way. Thank you and keep at it my good sire!
@@UncleDoug It was originally an american company, but i found some information about the UK branch: www.ourgreatyarmouth.org.uk/page_id__455_path__0p3p41p.aspx
Highly doubt that it’s an original, most likely the cap would have been a Radiospares. Never seen an Erie in a mid 60’s Marshall unless it was a replacement.
I am glad to find this channel. I am planning a couple of upcoming projects to keep my brain busy. Both being replicas of vintage Marshall amps. One being a jtm45 and the other being a jtm45/100. I want to be as authentic as I can be so great to watch these videos.
The editing program cuts at even seconds, not fractions of a second, so occasionally a word may be truncated. I reviewed the video several times and only noticed this once or twice......which, hopefully, did not ruin the whole video for you.
Another excellent tour of the history and techniques of these ancient and incredible equipment. Wonderfully driven by his technical ability, teaching and passion for the profession. Thank you for sharing. Greetings from Brazil. Here is the radio station PU2SRZ 73 and good winds.
This my old amp! Of the hundreds of Marshall's I've owned, this was the BEST Marshall I ever owned! Should have never sold it...lol. Happy to see it's pretty much in the same condition as when it left me!
Great to see this british guy fixed. Even after watching you repair a lot of amps, your videos keep the high level of entertaining and informative like the first video.
Hi Doug, you yet again have done it, I was having issues with my Dumble clone build. I was watching your video on Oscilloscopes and you had an issue much like mine where you had parasitic Oscillation and mentioned fender put low value capacitors between grid and earth on output valves ,well worked a treat now no more weird noises she sounds fantastic Thought i would share it with you as my wife is perplexed as to why i would want to do this stuff , BECAUSE ! To all you out there Doug is a wonderful teacher and an inspiration to me and many more. Thanks Doug it is people like you that make life worth living I really couldn't have done it without you. Nikk
@@UncleDoug Tell Ollie and Jack they are getting a very nice feel, strange I have watched so long I have been a part of them becoming talented musicians for Cats that is.
When I saw that the old can capacitor had been replaced and left in the amp I thought to myself this is the perfect opportunity to learn how to restuff one. Thank you for doing it that amp deserved it and thank you for showing us. The bonus footage of the fender was exciting. Another great video brought to us by the Master.
This Watches so easily it is dePendant on our so knowledgeable host..We appreciated seeing your Jewels and hearing your Pearls of wisdom. We also saw a beautiful Chain of two amps in this video and they were Ringing so delicately by the end. Uncle Doug you are a Diamond.
Thank you for making me look into my Bugera amp problem...started with the fuse..and there it was a small fuse in a large fuse holder..rattling around..funny though the fuse holder was just a bit small for large fuse. so had to change the holder, works fine now. Thanks again and stay well.
wish we had a doug in our country,so much love for his work..ive got over 20 amps of every era in my studio so where is doug when you need him.im starting to get good at repairs thanx to vids like this.even recap old desks nowadays..lovely work your a master
Hello Doug great video as always. From my experience when I performed a maintenance repair on my 1967 Super Reverb was finding a total of 8 cracked solder connections on various tube socket pins. The only way to see this is with high power lighting and an eye loop magnifier. This repaired issues I had when tapping on various preamp tubes. Just food for thought.
Hi. I have same model amp which dates, I believe from 1966, which I bought in 1979. It has the same block ends and GZ34 rectifier valve. The only difference is that mine has always had EL34 output valves. I was once lucky enough to visit the Marshall factory and Jim told me during lunch that they used whatever was available at the time. If the supply of a certain component dried up, they'd use another one. My JTM45 is still in regular use. In fact I will be gigging with it over the weekend. Nice to watch such an informative video.
Uncle Doug is a master of documentation. I have 3 hard drives with my life's work on them. I just finished a Fender 5F11 with the selenium recto. I used the 330K across the 56K and 1N4007 diode anode to the 10K. Bias set at -31.00 vdc. I love these videos. I have been doing repairs for 45 years +. Don't think you know it all. At times you will run into something stranger than fiction. It's the little overlooked things like a bad speaker,Bad Volume pot or tube socket pin that is corroded and will not clean up enough to even make continuity. I said to myself one day, (Why don't you make a file to scrap a preamp tube socket. I wound up using a D string from an acoustic guitar that perfectly fits most any preamp socket and cleans (Files) the socket pins as new. I had a 5E3 vintage amp that would not turn on the cathode feeding the 6V6 power tubes. All the cleaner Deoxit in the world made no difference. Problem found and solved with that D string.. I'll never forget that discovery! I still use it when in doubt.
I've got to tell you I'm severely burned out. But if I have 5 amps in here I just have to pace myself and especially parts orders. And worst case scenario of the occasional bad tubes new out of the box.
Uncle Doug, Bless you have always exceeded all of my expectations. Thank you for sharing your wisdom with us and keeping us safe!!! God Bless and Protect your Family!!!
A wonderful watch. I have a 1973 Marshall Lead and Bass 50 with both 1987 and 1986 channels (not sure how that works in practice or if they are basically the same with a couple of additions for one channel) and it was great to get such a detailed view of what is largely the same circuit. Thank you.
Thanks uncle Doug for the 2nd part of the video. The current limiter can really save tonnes of money as well. And in the first video, the sound of the JTM with P-90s is a killer. Wow! 💪🏻
Dear Uncle Doug and Jack, reg. the trimpot - it is not part of original circuit, and as you mentioned, obviously was built in years ago. Great video, to have the chance to look into the heart of the holy grail, Marhall JTM-45. Thank you very much !
Thanks for your helpful input, Klaus. By coincidence on one of the schematics they show the pot, but add that "it is a nice alteration to the circuit". It really made biasing much easier.
Great video with valuable info. I have 1965 Marshall block logo JTM45 MK ll, the difference being that the earlier chassis is all bent aluminum, no reinforced end plates. I also stuffed my original Hunt capacitor cans with small Nichicon caps to retain the original look. You videos are always a great learning experience, thanks!
Hello Doug, both transformers should have part numbers stamped on them. Main is a 1202-55 and the output is 784-103. Great job and always a pleasure watching you work.
Love your work UD. The JTM45 was my first scratch build, so holds a special place in my heart. Marshall cleans are the best cleans, it was nice to be validated in your sound demos. Would love to see some more Marshall videos but I'm to believe they are less common over in the US of A. Get so excited every time there is a notification of any new video
Thanks so much, Joey. You're right......I rarely receive any Marshall amps for repair, and even fewer Vox amps (none so far). They are quite rare in my area.
I still meet a lot of people who love Marshall amps and have no idea that some of them are based off other amps. One guy when I said his JTM 45 is a Bassman of sorts he was like "Marshalls are nothing like Fenders" haha. Thanks for the video, thats a clean looking amp on the outside for sure. (Still watching video).
Another hour plus of my life very well spent. The sound of this amp is so natural--some of this I believe due to the KT-66 tubes, I use them and love them as well, also love 7581 tubes for headroom. What really strikes me is how nice the build is, functionally and aesthetically. It really jumps out when looking at the Super Reverb-I think those amps cut a lot of corners (and still sound great...) I've been contemplating building an amp (from a kit) and this kind of settles me on the way to go! Loving all these videos.
@@UncleDoug Absolutely. From the tube testers to the wooden tools, disassembling pots and way beyond. And glad to have my feelings about JJ tubes confirmed, as well as my love of F&T caps. Your subjects and stories are gold, but the camera work and editing make it platinum. BTW, we make our cats wait until 8 PM to have tempations and thus can stretch a bucket up to 3-4 weeks! But they know exactly when it's 8 PM....
As a note Uncle Doug: I installed a momentary foot switch with a bypass switch on my current limiter. Keeps my fingers and face back during initial testing. Nice job!
I wonder where that amp has been on it's travels over the last 55 years. One of the things that I love is that amps like this have such lasting value. It's 55 years old and with the right TLC sounds amazing against amps made in 2021 and is hugely desirable. In a world where so much is disposable, this isn't. Great video Doug.
Dear Uncle Doug, I would like to voice my appreciation for your excellent channel. I am an undergraduate physics student, and I mess around with home built amplifiers and shortwave radios in my spare time. I have learned ever so much from your channel, especially as practical circuit design does not really figure into our electricity and magnetism course here at college. My best to you and Jack!
I was lucky enough to use one of these in a 3 day album tracking recording session about a decade ago...no other amp I seem to plug into has ever sounded right for me since.. .trully great amps and great video uncle Doug.
Thanks Uncle Doug!!! My Marshall 1978 Master Vol II (2104) just did the same thing last week that that Fender did - took out the 500mA HT fuse. Now I know where to start, although I ordered replacement can caps (3 of!) for the power supply anyway. HT fuse is a great idea! Shame though, those tubes (unmarked) sounded amazing, settled on them after a great deal of EL34 rolling as a teenager when I found myself with several sets. Also I checked the bias voltage and it was way down, so that probably shortened the time till death. It's a combo (topload) so you don't see red plating....
Hi Uncle Doug. I had a friend that bought one of these learly 70s from Brook Mays music in Dallas. The amp sound so good. The breakup better any new reissue amps. Thanks for the video. Enjoyed as usual.
I wish you lived next door so i could learn to fix my old broken amps. Also so we could get to the breakfast specials since my wife never wakes up before 10 a.m. lol. Thanks for the fun vids, God bless.
I had to look up parsec ... Ha! Uncle Doug, you kill us! Love it. You make me want to acquire more amp knowledge than the difference between volume and attenuation.
It’s like I’m in a high school and I like the subject, but you’re the class after lunch and after 20 minutes I’m asleep. I’ve watched this four times now.
Hooray! an hour of amp fixing and dry humour!
I hope you enjoy them both, Daniel :)
Me as well Uncle!! I wish i would have had a teacher like you when i was younger! You make learning fun!
Delightful.
I cant imagine a thumbs down for unc!!
... and music!
Who needs Netflix when we've got 76 minutes of Uncle Doug ?
Thanks so much, Giuseppe :)
Exactly!
Agreed!!
Bravo.
I know! My wife couldn't wrap her head around why i enjoy these so much, then she started loving to listen to him and she is not even a musician! I also steal many of his "Uncleisms"! One of my faves: we have wires hanging like a dis-embowled Antelope!😄
You generate a whole new respect for quality work on quality equipment. You go the extra mile.
Thanks so much, Cloyd :)
"Well, greetings out there in TH-cam land...." - when I hear this I know we are in for a treat! Thanks for the amp tech videos Uncle Doug!!!
Thanks !! I hope you enjoyed it, Charles.
Doug can give us British a lesson on dry humour :)
My Temptations starts now, I purr.
@@PandemoniumMeltDown maybe Jack or Casey will share their treats with you :) 🐱😺 meow
Uncle Doug is my favorite amp repair guy. His knowledge is very good and his attitude is the best. It is no wonder that people send him so many gifts. He is a wonderful human being. The world could use several billion people of his demeanor. The work displayed in this clip is highly commendable. Pretty much the norm for Uncle Doug.
Wow....thanks so much for all the very complimentary comments, Tony :)
agree . . .
@@UncleDoug will leave the most revered comments.
@@iceWaterProductions1 Thanks :)
A few comments on the video: 1.) I say "6V6" instead of "6L6" at 1:11:20. 2.) Thanks to Robert Set for the opening musical montage and logo. 3.) We tried jumpering Ch. 1 & Ch.2 for the audio demo, but for some reason it did not record well. 4.) It should be noted that Jim Marshall himself did not actually build the amps.....this task was done by Dudley Craven and Ken Bran.
Definitely feeling the opening montage.
Although Jim would frequently be covering cabinets in the early days and his signature can be found inside...
Who has a better story than Bran? jk
Uncle Doug getting a new video out means to stop anything, grab some tea or coffe and getting into yet another great repairing session with great humor :) I will need to get one of these Marshalls, some day...
Thanks so much, Andre. I hope you enjoy it :) We all need a JTM of our own :)
Check out the new Marshall Studio amps... while they are PCB instead of hand wired, their build quality is outstanding. Fact is, Marshall could teach Fender (and others) a thing or two about amp design.
Stop anything and grab some tea to watch ? André, do you have a spycam in my living room that I'm not aware of ? 🤔 I was supposed to start working, but got « distracted » by Doug's entertaining offering 😂
Wow that tip on stopping the high frequency oscillation was absolutely fantastic. I really appreciate that. Thank you so much, I will store that in the old memory banks. Great stuff.
Thanks, Leonard. Glad you enjoyed the video.
I'm just a guitar player. No electrical knowledge before finding your series of videos. I am always fascinated watching you work and explain all of the dark voodoo magic of electronics. Your attention to detail (respectful reverence?) towards this 66 JTM45 was awe-inspiring! I hit the thumbs up while wishing there was a guy standing on his chair applauding wildly I could trigger to let you know how much I appreciate your desire to always go above and beyond! Cherry custom shop work!
Wow....thanks so much for all the very nice comments, Kieron. We really appreciate hearing from you.
I love amps, but I'm not an electronics guy. 90% of the time I have no idea what UD is talking about, but these videos are so calming and stangely hypnotic...like watching Bob Ross paint.
Thanks, Ed. Bob and I appreciate your time and interest :)
Such a wonderful attack / decay and shimmer on this amp! Yes indeed , a hit maker in the studio !
Who else exploits the incredible clean Marshall settings.
@@karst41 Hendrix for one
I agree, Enid. One of my guitarist friends commented on the "chord bloom and chime".......it's a very special amp :)
Man Uncle Doug your attention to Detail and keeping this amp looking original is awesome I can’t believe I missed this video .
Thanks, Ricky. Glad you enjoyed it.
Superb video Uncle Doug. Some very innovative cosmetic enhancements with the capacitors that preserve the visual integrity of the amp. So much so that I consider the film to be worthy of mention and inclusion into the Smithsonian archives. We took these amps for granted many years ago here in the UK, so nice to see yourself and others appreciating and maintaining what you rightly describe as 'Jewels'
Thanks so much, F2 :)
Congratulations Doug on achieving your 100,000 subscribers -you thoroughly deserve it. The knowledge and the humour with which you pass on that knowledge makes every video a treat. Thank you for all of the effort that you put into each video. Thought that you might like to know that our new puppy - Penny is totally settled in and is proving to be a fantastic little character. She has brought a smile back to our faces after all of the health issues that I have and continue to have. Take care and it’s great to see you and your animal family back.
Thanks so much for all your kind words, Robin. All our love to Penny and best wishes for better health.
I can't tell you how much I appreciate your tuition, passion, love, care and respect for the craft. You truly are an inspiration and my favourite educator in this field by far. The efforts you go to to bring us these videos and the knowledge passed on during them are truly appreciated. Thank you, really. Best, Scott.
Wow, Scott, what a wonderful series of comments. We truly appreciate your kind words.
Watching this makes me want to build a 45. In 1970 I bought a Marshall Major 200 watt full stack , talk about a wall of sound. Thanks for the video great as always.
Glad you enjoyed it, Dennis :)
I think it was Ken Fischer (Trainwreck Amps), formerly of Ampeg, who said he put Mullard KT88s in a Marshall Major and "sailed past the 300 watt mark".
Wow Dennis that setup must have been so awesome! Especially if you can play well.
I never try the dangerous stuff at home. I used to do it at the neighbor's, until the fire... Anyway, great video! Thanks UD!
Safety begins at home, FWR......to heck with the neighbors ;) Glad you enjoyed it.
To be honest with you, I have never opened up an amplifier, however I love electronics and watch as many videos about different aspects of the subject as I can. I do love your videos because of the way you go into what is happening in a circuit and how each component can have such a drastic effect on the overall operation of the unit. Thanks a million for being one of my instructors, it's like being back in college once more, except instead of law, I am learning electronics!
Thanks so much, Jerry. We're glad the videos are informative :)
Congrats on reaching 100K subscribers! You're the best repair person on TH-cam!
Thank you so much, Jeff 😀
100k IS quite a milestone. Well done - it is an acknowledgement of the quality of your channel!
Uncle Doug, so wise, lovely, humble and... so relaxing to watch. My favourite YT channel.
Thanks. Glad to hear it :)
Super professional repair! What a Classic old amp. A dream amp in pristine condition. Thanks Uncle Doug 👍
You're welcome, Bob. So glad you liked it.
Hi, I really enjoy your videos for many years. I wish I lived in Texas to talk you into letting me apprentice with you. I could learn more than I do from your videos alone. Thank you for your teachings. I've learned so much from you.
That's great to hear, Steven. We're really glad the videos are helpful and informative.
Uncle Doug, love the channel, your attention to aesthetics and electrical precision makes it “must-see TV”! Congratulations on reaching 100K subscribers! Next goal is 250K. We’re all pulling for you!!!
Wow....thanks so much, Gerald :)
Excellent. The beauty of the current limiter is that it allows different bulbs to be installed so one can change the wattage limit drawn by the circuit. Super work Doug thank you.
Thanks, Graham. Yes, the load resistance can be readily changed.
Thanks so much for everything you do, Doug. I have learned a ton. Love the snazzy intro, too. You're the coolest Uncle I never had!
Wow....thanks so much, Matthew :)
UD IS THE BEST ENTERTAINMENT AND TECH INSTRUCTION IN THE WORLD
Wow......thanks so much, Rax :)
Congrats on that new intro, Uncle Doug!
Thanks, David. It was created by a viewer from Poland.
Your careful conservation and preservation versus someone's rapid repair. A beauty like this deserves nothing less. Spectabulous - as usual Sir!
Thanks, OL. Glad you liked it :)
Love the new intro.
Created by a very kind viewer, from Poland, I believe :)
Another fine amp repair video from Uncle Doug! Two landmark amps, a JTM 45 & a Super Rvb! So much to be learned from your electronix expertise. --> Thank you for your candor 😉
Thanks, Rich. So glad you enjoyed the videos.
Congratulations on 100k! The Marshall sounds great with all the pickup varieties and your work looks fantastic!
Wow....thanks so much KM :)
I can't tell anything unless it's dimed
I was lucky enough to own a '64 or '65 variant of this amp between 1969 and 1974 here in the UK. It had the Marshall name in a solid Perspex plate, and the knobs were the larger variety with brushed aluminium faces. Other than that, the amp here seems pretty much identical, with the weighty transformers and the KT 66s. I loved that amp, but it had a chequered history. I once loaned it to a pal, who forgot to connect the speaker cab and promptly burned out the output transformer. Then I had it stolen - twice! The first time it was recovered thanks to a diligent police detective and a pretty stupid thief. The second time, it was lifted from the band's van, and that was the last I saw of it. So thanks for the memories, Uncle Doug! Always love it when a new video appears.
Sorry to hear of your loss, David, but thanks for sharing your experiences with us :)
I see super amp tech has been here. A sad, lonely down vote. I have a dilemma now, because I am not super motivated to work on a Friday before a holiday weekend and Uncle Doug drops some amp goodness on us. I think a long lunch is in order.
Take the rest of the week off, Paul, and join me in scorning the slimy coward who voted "thumbs down" ;)
With the JTM 45 amp all dressed up working great, new tubes I hear why the P-90’s are so sought after. So perfect sound out of them from bass, mids, trebles just cloud like greatness out of them. Totally equal in volume. ❤❤❤❤. I started watching your channel some time ago. This rebuild I heard a smooth transition right in everyway. I thank you so much for all the lessons.
You're quite welcome, Greg. Thanks for your very nice comments :)
Why am I strangely drawn to watch these videos 3 and 4 times.....what's wrong with me!!!
Sounds like a case of good taste to me, R&B ;)
Look I dunno what the hells wrong with you rnb, but stop spreading it round will you ok? It could could be the next pandemic.
Your thorough on going technical trouble shooting proficiencies are astounding.
You are too kind, David. Thanks !!
Here's a saying that I heard all the time about these amps.
"It's only 45 watts, like a Bassman .... but those are British watts !" LOL
After being blasted by one of these jewels, I concede the wisdom of that statement, Zanky :)
@@UncleDoug , are those "keep calm and carry on" watts, "stiff upper lip" watts, or "get on with it!" watts? 😁🤔
@@goodun2974 Seagoon Watts.
RMS rather than peak measurement ?
@@highpath4776 "Seagoon"? Some British phrase which, as an American, I am not familiar with?
You're so good UD, I'm not going anywhere anytime soon. I can only see your channel grow and grow. Heck, you made me go from "hmm what, let's watch this simple thing again" to "caps are bad" and "thank God for the current limiter" before you've said it. I know your teaching works, because it works. And your ethics are second to none. You are an inspiration and a great place to take knowledge as far as needed: all the way.
Thank you and keep at it my good sire!
Wow....thanks so much for all the very nice comments, PM. We really appreciate them and will definitely keep at it :)
More to the point than I could have been.
Uncle Doug rides again!
Thanks for joining us, Bill :)
sounds silk smooth ... you are a magician
Thanks twice, Bruno :)
ERIE caps are definitely original, I replaced a handful of them in my vintage Laney Supergroup.
Thanks for the info, SK.
@@UncleDoug It was originally an american company, but i found some information about the UK branch:
www.ourgreatyarmouth.org.uk/page_id__455_path__0p3p41p.aspx
Highly doubt that it’s an original, most likely the cap would have been a Radiospares. Never seen an Erie in a mid 60’s Marshall unless it was a replacement.
@@MichaelJWane Well maybe it's not original for Marshalls but I believe Laneys are built with them, because in all the pictures you can see them.
Actually that amp would have been Hunts (taken over by Erie in 1969 so no, not original
I am glad to find this channel. I am planning a couple of upcoming projects to keep my brain busy. Both being replicas of vintage Marshall amps. One being a jtm45 and the other being a jtm45/100. I want to be as authentic as I can be so great to watch these videos.
We're glad the videos are helpful, William. Good luck with your projects.
Good job. However, you're cutting your clips short in editing cutting what you're saying off mid word/sentence.
The editing program cuts at even seconds, not fractions of a second, so occasionally a word may be truncated. I reviewed the video several times and only noticed this once or twice......which, hopefully, did not ruin the whole video for you.
@@UncleDoug Nice to be told why.
Another excellent tour of the history and techniques of these ancient and incredible equipment. Wonderfully driven by his technical ability, teaching and passion for the profession.
Thank you for sharing.
Greetings from Brazil.
Here is the radio station PU2SRZ
73 and good winds.
The pleasure was ours, Silvio. Thanks !!
Uncle Doug, thanks for all of the video's and your Knowledge, Your the Best,
Thanks for watching, CF.
This my old amp! Of the hundreds of Marshall's I've owned, this was the BEST Marshall I ever owned! Should have never sold it...lol. Happy to see it's pretty much in the same condition as when it left me!
Wow.....it's a small world. Thanks for the input :)
Great to see this british guy fixed. Even after watching you repair a lot of amps, your videos keep the high level of entertaining and informative like the first video.
Thanks so much, PoB :)
Those original GEC KT66s are nearly indestructible... great video.
Thanks, Hilario :)
Genalex
@@vayabroder729 Both are the same. General Electric Company, Ltd., Magnet
House, Kingsway, London W.C.2,
England
Osram Marconi
Many thanks Doug for the wonderful video. As usual it's full of great advice. Your knowledge and humour are greatly appreciated.
That's great to hear, RN :)
Hi Doug, you yet again have done it, I was having issues with my Dumble clone build. I was watching your video on Oscilloscopes and you had an issue much like mine where you had parasitic Oscillation and mentioned fender put low value capacitors between grid and earth on output valves ,well worked a treat now no more weird noises she sounds fantastic Thought i would share it with you as my wife is perplexed as to why i would want to do this stuff , BECAUSE !
To all you out there Doug is a wonderful teacher and an inspiration to me and many more. Thanks Doug it is people like you that make life worth living I really couldn't have done it without you. Nikk
I'm really glad the oscillation elimination technique worked for you, Nikk. Thanks so much for your very nice comments :)
@@UncleDoug Tell Ollie and Jack they are getting a very nice feel, strange I have watched so long I have been a part of them becoming talented musicians for Cats that is.
When I saw that the old can capacitor had been replaced and left in the amp I thought to myself this is the perfect opportunity to learn how to restuff one. Thank you for doing it that amp deserved it and thank you for showing us. The bonus footage of the fender was exciting. Another great video brought to us by the Master.
Our pleasure, Steve. Glad you enjoyed it :)
This Watches so easily it is dePendant on our so knowledgeable host..We appreciated seeing your Jewels and hearing your Pearls of wisdom. We also saw a beautiful Chain of two amps in this video and they were Ringing so delicately by the end. Uncle Doug you are a Diamond.
Wow....thanks for all the gem comparisons, IL :)
Thank you for making me look into my Bugera amp problem...started with the fuse..and there it was a small fuse in a large fuse holder..rattling around..funny though the fuse holder was just a bit small for large fuse. so had to change the holder, works fine now. Thanks again and stay well.
You're welcome, Mr. A. I'm glad you were able to resolve the problem.
An excellent and relatively simple repair. Part two was very impressive! Thank you for taking the time to share your knowledge.
The pleasure was ours, Andrew. Thanks for watching.
Very nice work Doug! The extra effort of installing the replacement cap inside the can is inspiring…
Thanks so much, Byron.
Yeah I like stuffing caps!
wish we had a doug in our country,so much love for his work..ive got over 20 amps of every era in my studio so where is doug when you need him.im starting to get good at repairs thanx to vids like this.even recap old desks nowadays..lovely work your a master
Wow....thanks so much, Pat. We really appreciate the kind words :)
I have never in my life heard a Marshal clean channel sound so nice over yout tube , holy cow batman
Thanks so much, Jerry. High praise indeed :)
Hello Doug great video as always. From my experience when I performed a maintenance repair on my 1967 Super Reverb was finding a total of 8 cracked solder connections on various tube socket pins. The only way to see this is with high power lighting and an eye loop magnifier. This repaired issues I had when tapping on various preamp tubes. Just food for thought.
Thanks for the helpful tip, David.
My teacher always warned us from pointing with pencils into circuits. Carbon is very conductive 😀
Good video about one of my favorite amps!
Did your teacher realize that the carbon is completely encased in wood.....an excellent insulator? Thanks, B :)
@@UncleDoug yes, but some pencils tend do be open on the backside, e.g. if the rubber is lost or someone sharpened both ends or even chew a piece off.
Hi. I have same model amp which dates, I believe from 1966, which I bought in 1979. It has the same block ends and GZ34 rectifier valve. The only difference is that mine has always had EL34 output valves. I was once lucky enough to visit the Marshall factory and Jim told me during lunch that they used whatever was available at the time. If the supply of a certain component dried up, they'd use another one. My JTM45 is still in regular use. In fact I will be gigging with it over the weekend. Nice to watch such an informative video.
Thanks so much for your input, Martyn, and best of luck with your JTM45. It's great to hear that it's still in action :)
How can something be so enjoyable to watch ... even though i haven’t a clue what doug is talking about .
Wish i new more about electronics .
That's kind of you to say, Graham. Keep watching and it will gradually become much clearer.
Definitely go through Uncle Doug’s back catalog and I can also recommend the channel Mr. Carlson’s Lab.
There is life on youtube. Such an ignorant viewer as I, getting a peek behind the curtain. Thank you. I watch these in (mostly) mute amazement.
Thanks, Clay. We appreciate your time and interest.
Uncle Doug is a master of documentation. I have 3 hard drives with my life's work on them. I just finished a Fender 5F11 with the selenium recto. I used the 330K across the 56K and 1N4007 diode anode to the 10K. Bias set at -31.00 vdc. I love these videos. I have been doing repairs for 45 years +. Don't think you know it all. At times you will run into something stranger than fiction. It's the little overlooked things like a bad speaker,Bad Volume pot or tube socket pin that is corroded and will not clean up enough to even make continuity. I said to myself one day, (Why don't you make a file to scrap a preamp tube socket. I wound up using a D string from an acoustic guitar that perfectly fits most any preamp socket and cleans (Files) the socket pins as new. I had a 5E3 vintage amp that would not turn on the cathode feeding the 6V6 power tubes. All the cleaner Deoxit in the world made no difference. Problem found and solved with that D string.. I'll never forget that discovery! I still use it when in doubt.
Thanks for your helpful input, TA. I'll give the guitar string suggestion a try :)
With B+ drained of course. @@UncleDoug
Always, TA :)@@triodeamplification5568
I've got to tell you I'm severely burned out. But if I have 5 amps in here I just have to pace myself and especially parts orders. And worst case scenario of the occasional bad tubes new out of the box.
I sympathize with the burn out. I have to take some time off occasionally to recharge the old batteries.@@triodeamplification5568
Uncle Doug, Bless you have always exceeded all of my expectations. Thank you for sharing your wisdom with us and keeping us safe!!!
God Bless and Protect your Family!!!
Thanks, F1. Likewise to you and yours.
A wonderful watch. I have a 1973 Marshall Lead and Bass 50 with both 1987 and 1986 channels (not sure how that works in practice or if they are basically the same with a couple of additions for one channel) and it was great to get such a detailed view of what is largely the same circuit. Thank you.
You're welcome, Stub. Glad you enjoyed it.
Why would anybody put a "thumbs down" on a video like this? The dude is trouble shooting a 55 year old amp that he has never seen before. Great Video!
Thanks so much, Lev. Don't waste any concern on the slobbering coward(s) who deface those videos they envy the most ;)
Oh yeah! When you’re that good in your profession the following comes easy. You sir are a master
Thanks so much, David :)
Thanks uncle Doug for the 2nd part of the video. The current limiter can really save tonnes of money as well.
And in the first video, the sound of the JTM with P-90s is a killer. Wow! 💪🏻
Glad you enjoyed the video, Shade.
Proud to be one of those 100,000 subscribers.
Well, excellent video as always.
Thanks you Uncle Doug.
Thanks twice, Reggie :)
Dear Uncle Doug and Jack, reg. the trimpot - it is not part of original circuit, and as you mentioned, obviously was built in years ago. Great video, to have the chance to look into the heart of the holy grail, Marhall JTM-45. Thank you very much !
Thanks for your helpful input, Klaus. By coincidence on one of the schematics they show the pot, but add that "it is a nice alteration to the circuit". It really made biasing much easier.
Thanks for another excellent hour+ with Jack an friends!
Thanks for joining us, Brian.
Great video with valuable info. I have 1965 Marshall block logo JTM45 MK ll, the difference being that the earlier chassis is all bent aluminum, no reinforced end plates. I also stuffed my original Hunt capacitor cans with small Nichicon caps to retain the original look.
You videos are always a great learning experience, thanks!
Glad you enjoyed it Alain :)
Great tones. Even on my phone speakers. I'm sure it's a million times better in person. Great video
Thanks, Jason :)
MacGyvering the Erie cap was total madness. Bravo.
Agreed, David, but trying new things makes life interesting :)
We all missed you, uncle Doug. Nice to see you here again!!!
Thanks, Fich. It's great to be back :)
Above and beyond with that Erie concealment cap. Really nice work Doug👍
Thanks so much, Rob.
Hello Doug, both transformers should have part numbers stamped on them. Main is a 1202-55 and the output is 784-103. Great job and always a pleasure watching you work.
Thanks, Brian :)
Love your work UD. The JTM45 was my first scratch build, so holds a special place in my heart. Marshall cleans are the best cleans, it was nice to be validated in your sound demos. Would love to see some more Marshall videos but I'm to believe they are less common over in the US of A. Get so excited every time there is a notification of any new video
Thanks so much, Joey. You're right......I rarely receive any Marshall amps for repair, and even fewer Vox amps (none so far). They are quite rare in my area.
I still meet a lot of people who love Marshall amps and have no idea that some of them are based off other amps. One guy when I said his JTM 45 is a Bassman of sorts he was like "Marshalls are nothing like Fenders" haha. Thanks for the video, thats a clean looking amp on the outside for sure. (Still watching video).
Those people really need to do some research to clarify their thinking.
Thanx Doug……….you’re the bomb…………….absolutely love all of your videos……….rock on………….Rob
Thanks, Rob. So glad you enjoy our vids :)
No substitute for accumulation of knowledge … well done sir!
Thanks, Richard :)
Another hour plus of my life very well spent. The sound of this amp is so natural--some of this I believe due to the KT-66 tubes, I use them and love them as well, also love 7581 tubes for headroom. What really strikes me is how nice the build is, functionally and aesthetically. It really jumps out when looking at the Super Reverb-I think those amps cut a lot of corners (and still sound great...) I've been contemplating building an amp (from a kit) and this kind of settles me on the way to go! Loving all these videos.
Thanks, Stewart. I hope the videos are informative.
@@UncleDoug Absolutely. From the tube testers to the wooden tools, disassembling pots and way beyond. And glad to have my feelings about JJ tubes confirmed, as well as my love of F&T caps. Your subjects and stories are gold, but the camera work and editing make it platinum. BTW, we make our cats wait until 8 PM to have tempations and thus can stretch a bucket up to 3-4 weeks! But they know exactly when it's 8 PM....
@@stewartcohen7683 Thanks so much, Stewart. Our ravenous scoundrels demand treats at all hours ;)
As a note Uncle Doug: I installed a momentary foot switch with a bypass switch on my current limiter. Keeps my fingers and face back during initial testing. Nice job!
Very clever, Byron. Best of luck with your modification.
I wonder where that amp has been on it's travels over the last 55 years. One of the things that I love is that amps like this have such lasting value. It's 55 years old and with the right TLC sounds amazing against amps made in 2021 and is hugely desirable. In a world where so much is disposable, this isn't. Great video Doug.
Thanks so much, Duncan. I definitely agree :)
I really enjoy yer videos. Keep up the great work and videos. I'm 70 now and still jamming. Rusty in eastern Tennessee
Glad to hear it, Rusty. Keep up the good work.
once again a pleasure to see what kind of treasures you have on the table. i like the new intro too.
Thanks, Meik. Glad you like it :)
Dear Uncle Doug,
I would like to voice my appreciation for your excellent channel. I am an undergraduate physics student, and I mess around with home built amplifiers and shortwave radios in my spare time. I have learned ever so much from your channel, especially as practical circuit design does not really figure into our electricity and magnetism course here at college. My best to you and Jack!
We're glad the videos have been informative, Kiran. Good luck to you.
@@UncleDoug Thanks!
Simply an amazing display of talent, years of hard work and accumulated knowledge. Without doubt.,..Best in The Business!! Thank you Sir!!
Wow....thanks so much, DR :)
I was lucky enough to use one of these in a 3 day album tracking recording session about a decade ago...no other amp I seem to plug into has ever sounded right for me since.. .trully great amps and great video uncle Doug.
Thanks so much, Alex :)
Thanks Uncle Doug!!! My Marshall 1978 Master Vol II (2104) just did the same thing last week that that Fender did - took out the 500mA HT fuse. Now I know where to start, although I ordered replacement can caps (3 of!) for the power supply anyway. HT fuse is a great idea! Shame though, those tubes (unmarked) sounded amazing, settled on them after a great deal of EL34 rolling as a teenager when I found myself with several sets. Also I checked the bias voltage and it was way down, so that probably shortened the time till death. It's a combo (topload) so you don't see red plating....
Good luck with your project, M.
You are the man, Doug. Good job.
Thanks, LB :)
Another great amp repair thanks Uncle Doug.
You're welcome, Nigel :)
Hi Uncle Doug. I had a friend that bought one of these learly 70s from Brook Mays music in Dallas. The amp sound so good. The breakup better any new reissue amps. Thanks for the video. Enjoyed as usual.
You're welcome, Monty :)
Thank you for a great doubleheader video, Uncle Doug!
You're welcome, Hub.
I wish you lived next door so i could learn to fix my old broken amps. Also so we could get to the breakfast specials since my wife never wakes up before 10 a.m. lol. Thanks for the fun vids, God bless.
It would be great to have a neighbor with a common interest, Ed, and breakfast is supposed to be "our most important meal" :)
I had to look up parsec ... Ha! Uncle Doug, you kill us! Love it. You make me want to acquire more amp knowledge than the difference between volume and attenuation.
Glad you enjoyed it, GT :)
Uncle Doug! That repurposing of a 1940s jukebox power cord shrowd was GENIUS! Worth the price of admission :) (25:40)
Thanks so much, David :)
The Return of Uncle Doug: you were missed. Another classic problem solving episode. THANKS.
Our pleasure, Ray. Thanks !!
Oh yeah! Going to be the perfect saturday night watching this. I love these videos! Thanks uncle Doug
Our pleasure, RJ. I hope you enjoy them.
It’s like I’m in a high school and I like the subject, but you’re the class after lunch and after 20 minutes I’m asleep. I’ve watched this four times now.
That's because we make you feel cozy and safe, David.