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1966 Marshall JTM-45 Mk II in for Repairs......A Rare and Wonderful Gem !! 

Uncle Doug
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This video documents the repair of a splendid 1966 Marshall JTM-45 MkII amp sent to us for repairs. The initial problems cited were a "gap" in one of the volume controls and a tendency to "red-plate".....but, as you will see, other issues arose. Also, due to the "special nature" of this wonderful old amp, we sought to make component substitutions as unobtrusive as possible.
In addition, we open some gifts from a very generous viewer.....with Jack and KC's help, of course.....and feature a second video showing one method to repair a "scary" problem in a BF Super Reverb.
Thanks to all our Patreon patrons and PayPal contributors for your continued support, and to all of you who helped us reach the lofty goal of 100,000 Subscribers !!! Way back when we posted our first video on YT, we never dreamed things would turn out this way......and they would not have, without our wonderful viewers. Thanks for making this such a rewarding experience.
If you would like to support our channel, please consider becoming a Patreon patron at / uncledougsvintageamps or making a PayPal contribution to dldcam@aol.com. Regardless, we really appreciate your time and interest in our channel.

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3 окт 2024

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Комментарии : 1,4 тыс.   
@GiuBernardi
@GiuBernardi 3 года назад
Who needs Netflix when we've got 76 minutes of Uncle Doug ?
@UncleDoug
@UncleDoug 3 года назад
Thanks so much, Giuseppe :)
@Ron_Padgett
@Ron_Padgett 3 года назад
Exactly!
@Darylvb
@Darylvb 3 года назад
Agreed!!
@mikeroadblock
@mikeroadblock 3 года назад
Bravo.
@mitchmorris4998
@mitchmorris4998 3 года назад
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!😄
@SevenPillarOfFolly
@SevenPillarOfFolly 3 года назад
Hooray! an hour of amp fixing and dry humour!
@UncleDoug
@UncleDoug 3 года назад
I hope you enjoy them both, Daniel :)
@mitchmorris4998
@mitchmorris4998 3 года назад
Me as well Uncle!! I wish i would have had a teacher like you when i was younger! You make learning fun!
@mikeroadblock
@mikeroadblock 3 года назад
Delightful.
@mitchmorris4998
@mitchmorris4998 3 года назад
I cant imagine a thumbs down for unc!!
@PandemoniumMeltDown
@PandemoniumMeltDown 3 года назад
... and music!
@tonymelendez9295
@tonymelendez9295 2 года назад
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.
@UncleDoug
@UncleDoug 2 года назад
Wow....thanks so much for all the very complimentary comments, Tony :)
@Headwind-1
@Headwind-1 Год назад
agree . . .
@iceWaterProductions1
@iceWaterProductions1 Год назад
@@UncleDoug will leave the most revered comments.
@UncleDoug
@UncleDoug Год назад
@@iceWaterProductions1 Thanks :)
@raxxtango
@raxxtango 3 года назад
UD IS THE BEST ENTERTAINMENT AND TECH INSTRUCTION IN THE WORLD
@UncleDoug
@UncleDoug 3 года назад
Wow......thanks so much, Rax :)
@Charlie-Oooooo
@Charlie-Oooooo 3 года назад
"Well, greetings out there in RU-vid land...." - when I hear this I know we are in for a treat! Thanks for the amp tech videos Uncle Doug!!!
@UncleDoug
@UncleDoug 3 года назад
Thanks !! I hope you enjoyed it, Charles.
@thesillyhatday
@thesillyhatday 3 года назад
Doug can give us British a lesson on dry humour :)
@PandemoniumMeltDown
@PandemoniumMeltDown 3 года назад
My Temptations starts now, I purr.
@Charlie-Oooooo
@Charlie-Oooooo 3 года назад
@@PandemoniumMeltDown maybe Jack or Casey will share their treats with you :) 🐱😺 meow
@stevenmoffitt1643
@stevenmoffitt1643 5 месяцев назад
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.
@UncleDoug
@UncleDoug 5 месяцев назад
That's great to hear, Steven. We're really glad the videos are helpful and informative.
@UncleDoug
@UncleDoug 3 года назад
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.
@rillloudmother
@rillloudmother 3 года назад
Definitely feeling the opening montage.
@scottdunn2178
@scottdunn2178 3 года назад
Although Jim would frequently be covering cabinets in the early days and his signature can be found inside...
@guitarisdead1642
@guitarisdead1642 3 года назад
Who has a better story than Bran? jk
@cloydsprenkle5170
@cloydsprenkle5170 3 года назад
You generate a whole new respect for quality work on quality equipment. You go the extra mile.
@UncleDoug
@UncleDoug 3 года назад
Thanks so much, Cloyd :)
@andrefranco6814
@andrefranco6814 3 года назад
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...
@UncleDoug
@UncleDoug 3 года назад
Thanks so much, Andre. I hope you enjoy it :) We all need a JTM of our own :)
@TucsonBillD
@TucsonBillD 3 года назад
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.
@unboxedtravels
@unboxedtravels 3 года назад
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 😂
@jerryhatrick5860
@jerryhatrick5860 2 года назад
I have never in my life heard a Marshal clean channel sound so nice over yout tube , holy cow batman
@UncleDoug
@UncleDoug 2 года назад
Thanks so much, Jerry. High praise indeed :)
@leonardpeters3266
@leonardpeters3266 2 года назад
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.
@UncleDoug
@UncleDoug 2 года назад
Thanks, Leonard. Glad you enjoyed the video.
@Rugbyman269
@Rugbyman269 3 года назад
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 .
@UncleDoug
@UncleDoug 3 года назад
That's kind of you to say, Graham. Keep watching and it will gradually become much clearer.
@hubbsllc
@hubbsllc 3 года назад
Definitely go through Uncle Doug’s back catalog and I can also recommend the channel Mr. Carlson’s Lab.
@enidsnarb
@enidsnarb 3 года назад
Such a wonderful attack / decay and shimmer on this amp! Yes indeed , a hit maker in the studio !
@karst41
@karst41 3 года назад
Who else exploits the incredible clean Marshall settings.
@enidsnarb
@enidsnarb 3 года назад
@@karst41 Hendrix for one
@UncleDoug
@UncleDoug 3 года назад
I agree, Enid. One of my guitarist friends commented on the "chord bloom and chime".......it's a very special amp :)
@harmonsalmon7739
@harmonsalmon7739 Год назад
Uncle that sounds fantastic brother, you're a genius.
@UncleDoug
@UncleDoug Год назад
Wow....thanks, Harmon :)
@KKMcK1
@KKMcK1 3 года назад
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!
@UncleDoug
@UncleDoug 3 года назад
Wow....thanks so much for all the very nice comments, Kieron. We really appreciate hearing from you.
@shade057
@shade057 8 месяцев назад
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! 💪🏻
@UncleDoug
@UncleDoug 8 месяцев назад
Glad you enjoyed the video, Shade.
@fostexfan160
@fostexfan160 2 года назад
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'
@UncleDoug
@UncleDoug 2 года назад
Thanks so much, F2 :)
@jasonkeen712
@jasonkeen712 3 года назад
Great tones. Even on my phone speakers. I'm sure it's a million times better in person. Great video
@UncleDoug
@UncleDoug 3 года назад
Thanks, Jason :)
@robinosborne266
@robinosborne266 3 года назад
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.
@UncleDoug
@UncleDoug 3 года назад
Thanks so much for all your kind words, Robin. All our love to Penny and best wishes for better health.
@w.rustylane5650
@w.rustylane5650 2 года назад
I really enjoy yer videos. Keep up the great work and videos. I'm 70 now and still jamming. Rusty in eastern Tennessee
@UncleDoug
@UncleDoug 2 года назад
Glad to hear it, Rusty. Keep up the good work.
@Skman22
@Skman22 3 года назад
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.
@UncleDoug
@UncleDoug 3 года назад
Wow, Scott, what a wonderful series of comments. We truly appreciate your kind words.
@WilliamPayneNZ
@WilliamPayneNZ Год назад
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.
@UncleDoug
@UncleDoug Год назад
We're glad the videos are helpful, William. Good luck with your projects.
@fullwaverecked
@fullwaverecked 3 года назад
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!
@UncleDoug
@UncleDoug 3 года назад
Safety begins at home, FWR......to heck with the neighbors ;) Glad you enjoyed it.
@SeanWeaver
@SeanWeaver Год назад
"When I grow up I want to be a guitar player. I want to be able to have enough money so I could buy a huge amp named a Marshall Full Stack." I wrote this for a school paper when I was 12 years old! Still don't have the Marshall but the neighbors thank me for that
@UncleDoug
@UncleDoug Год назад
It never hurts to dream :)
@zankyalbo2208
@zankyalbo2208 3 года назад
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
@UncleDoug
@UncleDoug 3 года назад
After being blasted by one of these jewels, I concede the wisdom of that statement, Zanky :)
@goodun2974
@goodun2974 3 года назад
@@UncleDoug , are those "keep calm and carry on" watts, "stiff upper lip" watts, or "get on with it!" watts? 😁🤔
@highpath4776
@highpath4776 3 года назад
@@goodun2974 Seagoon Watts.
@highpath4776
@highpath4776 3 года назад
RMS rather than peak measurement ?
@goodun2974
@goodun2974 3 года назад
@@highpath4776 "Seagoon"? Some British phrase which, as an American, I am not familiar with?
@robwatts7863
@robwatts7863 2 года назад
Above and beyond with that Erie concealment cap. Really nice work Doug👍
@UncleDoug
@UncleDoug 2 года назад
Thanks so much, Rob.
@jeffcotton526
@jeffcotton526 3 года назад
Congrats on reaching 100K subscribers! You're the best repair person on RU-vid!
@UncleDoug
@UncleDoug 3 года назад
Thank you so much, Jeff 😀
@cass2771
@cass2771 3 года назад
100k IS quite a milestone. Well done - it is an acknowledgement of the quality of your channel!
@LevRage
@LevRage 3 года назад
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!
@UncleDoug
@UncleDoug 3 года назад
Thanks so much, Lev. Don't waste any concern on the slobbering coward(s) who deface those videos they envy the most ;)
@geraldmcquaid5383
@geraldmcquaid5383 3 года назад
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!!!
@UncleDoug
@UncleDoug 3 года назад
Wow....thanks so much, Gerald :)
@holmes1978
@holmes1978 2 года назад
Sir you are amazing God Bless your excellence in your work !
@UncleDoug
@UncleDoug 2 года назад
Thanks, LH :)
@bobboitt3126
@bobboitt3126 3 года назад
Super professional repair! What a Classic old amp. A dream amp in pristine condition. Thanks Uncle Doug 👍
@UncleDoug
@UncleDoug 3 года назад
You're welcome, Bob. So glad you liked it.
@hgostos
@hgostos 3 года назад
Those original GEC KT66s are nearly indestructible... great video.
@UncleDoug
@UncleDoug 3 года назад
Thanks, Hilario :)
@vayabroder729
@vayabroder729 3 года назад
Genalex
@hgostos
@hgostos 3 года назад
@@vayabroder729 Both are the same. General Electric Company, Ltd., Magnet House, Kingsway, London W.C.2, England
@AlainGuindon
@AlainGuindon 2 года назад
Osram Marconi
@gregbrown9882
@gregbrown9882 3 года назад
Love the new intro.
@UncleDoug
@UncleDoug 3 года назад
Created by a very kind viewer, from Poland, I believe :)
@nigman2023
@nigman2023 3 года назад
Another great amp repair thanks Uncle Doug.
@UncleDoug
@UncleDoug 3 года назад
You're welcome, Nigel :)
@matthewzimmerer3329
@matthewzimmerer3329 3 года назад
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!
@UncleDoug
@UncleDoug 3 года назад
Wow....thanks so much, Matthew :)
@rickycompton2610
@rickycompton2610 2 года назад
Man Uncle Doug your attention to Detail and keeping this amp looking original is awesome I can’t believe I missed this video .
@UncleDoug
@UncleDoug 2 года назад
Thanks, Ricky. Glad you enjoyed it.
@dhpbear2
@dhpbear2 3 года назад
Congrats on that new intro, Uncle Doug!
@UncleDoug
@UncleDoug 3 года назад
Thanks, David. It was created by a viewer from Poland.
@Headwind-1
@Headwind-1 Год назад
nice fix . . .thanks Doug . .no ads . . .
@Headwind-1
@Headwind-1 Год назад
enjoyed part 2 so well explained thanks once again uncly doug
@UncleDoug
@UncleDoug Год назад
@@Headwind-1 Glad you enjoyed them, Ged.
@RhythemNBlues
@RhythemNBlues 3 года назад
Why am I strangely drawn to watch these videos 3 and 4 times.....what's wrong with me!!!
@UncleDoug
@UncleDoug 3 года назад
Sounds like a case of good taste to me, R&B ;)
@nevillegoddard4966
@nevillegoddard4966 2 года назад
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.
@hubbsllc
@hubbsllc 3 года назад
Thank you for a great doubleheader video, Uncle Doug!
@UncleDoug
@UncleDoug 3 года назад
You're welcome, Hub.
@WillyMcCoy50
@WillyMcCoy50 3 года назад
Congratulations on 100k! The Marshall sounds great with all the pickup varieties and your work looks fantastic!
@UncleDoug
@UncleDoug 3 года назад
Wow....thanks so much KM :)
@greg4673
@greg4673 2 года назад
I can't tell anything unless it's dimed
@lexzbuddy
@lexzbuddy 3 года назад
You are the man, Doug. Good job.
@UncleDoug
@UncleDoug 3 года назад
Thanks, LB :)
@preiter20
@preiter20 3 года назад
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.
@UncleDoug
@UncleDoug 3 года назад
Take the rest of the week off, Paul, and join me in scorning the slimy coward who voted "thumbs down" ;)
@tocsa120ls
@tocsa120ls 3 года назад
Congrats on the silver RU-vid creator button!
@UncleDoug
@UncleDoug 3 года назад
Thanks, Tocsa. So far, YT hasn't told us it's "in the mail" :(
@TucsonBillD
@TucsonBillD 3 года назад
Uncle Doug rides again!
@UncleDoug
@UncleDoug 3 года назад
Thanks for joining us, Bill :)
@clayz1
@clayz1 2 года назад
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.
@UncleDoug
@UncleDoug 2 года назад
Thanks, Clay. We appreciate your time and interest.
@szaki95
@szaki95 3 года назад
ERIE caps are definitely original, I replaced a handful of them in my vintage Laney Supergroup.
@UncleDoug
@UncleDoug 3 года назад
Thanks for the info, SK.
@szaki95
@szaki95 3 года назад
@@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
@MichaelJWane
@MichaelJWane 3 года назад
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.
@szaki95
@szaki95 3 года назад
@@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.
@LD-cn1qe
@LD-cn1qe 3 года назад
Actually that amp would have been Hunts (taken over by Erie in 1969 so no, not original
@AstrosElectronicsLab
@AstrosElectronicsLab 3 года назад
Good job. However, you're cutting your clips short in editing cutting what you're saying off mid word/sentence.
@UncleDoug
@UncleDoug 3 года назад
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.
@beachcomber2008
@beachcomber2008 3 года назад
@@UncleDoug Nice to be told why.
@BrunoWiebelt
@BrunoWiebelt 3 года назад
sounds silk smooth ... you are a magician
@UncleDoug
@UncleDoug 3 года назад
Thanks twice, Bruno :)
@GrowerTalks
@GrowerTalks Год назад
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.
@UncleDoug
@UncleDoug Год назад
Glad you enjoyed it, GT :)
@mookytc
@mookytc 2 года назад
Enjoyed the sound clips with settings at the end!
@UncleDoug
@UncleDoug 2 года назад
Glad you enjoyed it, M.
@rothbekirkendall7756
@rothbekirkendall7756 3 года назад
Sorry ,I'm late. Very clean and comprehensive job, (As usual). Your customer should, be very HAPPY with it. Great video.
@UncleDoug
@UncleDoug 3 года назад
Thanks, RK. He is quite pleased :)
@JerryEricsson
@JerryEricsson 3 года назад
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!
@UncleDoug
@UncleDoug 3 года назад
Thanks so much, Jerry. We're glad the videos are informative :)
@MrAndfio
@MrAndfio 3 года назад
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.
@UncleDoug
@UncleDoug 3 года назад
You're welcome, Mr. A. I'm glad you were able to resolve the problem.
@edbyrnes
@edbyrnes 3 года назад
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.
@UncleDoug
@UncleDoug 3 года назад
Thanks, Ed. Bob and I appreciate your time and interest :)
@rosettenzerrer
@rosettenzerrer 3 года назад
My teacher always warned us from pointing with pencils into circuits. Carbon is very conductive 😀 Good video about one of my favorite amps!
@UncleDoug
@UncleDoug 3 года назад
Did your teacher realize that the carbon is completely encased in wood.....an excellent insulator? Thanks, B :)
@rosettenzerrer
@rosettenzerrer 3 года назад
@@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.
@greblus
@greblus Год назад
Uncle Doug, so wise, lovely, humble and... so relaxing to watch. My favourite YT channel.
@UncleDoug
@UncleDoug Год назад
Thanks. Glad to hear it :)
@dennisapplegate7553
@dennisapplegate7553 3 года назад
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.
@UncleDoug
@UncleDoug 3 года назад
Glad you enjoyed it, Dennis :)
@goodun2974
@goodun2974 3 года назад
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".
@nevillegoddard4966
@nevillegoddard4966 2 года назад
Wow Dennis that setup must have been so awesome! Especially if you can play well.
@josedealva4205
@josedealva4205 3 года назад
new logo is nice! was not aware of it Uncle Doug. You have my utmost respect.
@UncleDoug
@UncleDoug 3 года назад
Thanks so much, Jose.
@Mountainrock70
@Mountainrock70 2 года назад
Doug at 56:43 -57:08 I was really feeling it and diggin’! I liked all your playing, but that was where the real magic took place!
@UncleDoug
@UncleDoug 2 года назад
I'll tell Ollie and Jack how much you enjoyed it, MR. Thanks :)
@triodeamplification5568
@triodeamplification5568 7 месяцев назад
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.
@UncleDoug
@UncleDoug 7 месяцев назад
Thanks for your helpful input, TA. I'll give the guitar string suggestion a try :)
@triodeamplification5568
@triodeamplification5568 7 месяцев назад
With B+ drained of course. @@UncleDoug
@UncleDoug
@UncleDoug 7 месяцев назад
Always, TA :)@@triodeamplification5568
@triodeamplification5568
@triodeamplification5568 7 месяцев назад
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.
@UncleDoug
@UncleDoug 7 месяцев назад
I sympathize with the burn out. I have to take some time off occasionally to recharge the old batteries.@@triodeamplification5568
@Eddy63
@Eddy63 3 года назад
Nice vid U D ... I think were gonna keep you around ... Lol ... Enjoy the long weekend ... Especially if your a Vet ...Thnx everyone for your service ,,,
@UncleDoug
@UncleDoug 3 года назад
Thanks, Eddy. You too!
@davidsigglekow1349
@davidsigglekow1349 3 года назад
Your thorough on going technical trouble shooting proficiencies are astounding.
@UncleDoug
@UncleDoug 3 года назад
You are too kind, David. Thanks !!
@ourlifeinwyoming4654
@ourlifeinwyoming4654 8 месяцев назад
Your careful conservation and preservation versus someone's rapid repair. A beauty like this deserves nothing less. Spectabulous - as usual Sir!
@UncleDoug
@UncleDoug 5 месяцев назад
Thanks, OL. Glad you liked it :)
@vainwretch
@vainwretch 3 года назад
Always look forward to seeing your videos .
@UncleDoug
@UncleDoug 3 года назад
Thanks !! Glad you like them, VW :)
@Rich915
@Rich915 3 года назад
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 😉
@UncleDoug
@UncleDoug 3 года назад
Thanks, Rich. So glad you enjoyed the videos.
@nathanbouton6700
@nathanbouton6700 2 года назад
Baby A-be (Abhinna, Abe for short) loves to fall asleep to the steady even voice of uncle Doug. Works every time. Lol
@UncleDoug
@UncleDoug 2 года назад
I had the same effect on my students back in my teaching days, Nathan. Seriously.....glad to hear it.
@ctcards2636
@ctcards2636 2 года назад
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).
@UncleDoug
@UncleDoug 2 года назад
Those people really need to do some research to clarify their thinking.
@DBroce
@DBroce 3 года назад
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.
@UncleDoug
@UncleDoug 3 года назад
That's because we make you feel cozy and safe, David.
@klauspopp8322
@klauspopp8322 3 года назад
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 !
@UncleDoug
@UncleDoug 3 года назад
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.
@ronnie5129
@ronnie5129 2 года назад
Uncle Doug, thanks for all of the video's and your Knowledge, Your the Best,
@UncleDoug
@UncleDoug 2 года назад
Thanks for watching, CF.
@karst41
@karst41 3 года назад
Man another killer sounding amp,.The P90’s were spectacular. sadly the only pedal steel I heard playing was only in my head. cheers
@UncleDoug
@UncleDoug 3 года назад
Thanks !! Our pedal steel player is in rehab, Kars. Maybe next video ;)
@stewartcohen7683
@stewartcohen7683 2 года назад
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
@UncleDoug 2 года назад
Thanks, Stewart. I hope the videos are informative.
@stewartcohen7683
@stewartcohen7683 2 года назад
@@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....
@UncleDoug
@UncleDoug 2 года назад
@@stewartcohen7683 Thanks so much, Stewart. Our ravenous scoundrels demand treats at all hours ;)
@davidclark3603
@davidclark3603 2 года назад
That was absolutely brilliant that. Thanks.
@UncleDoug
@UncleDoug 2 года назад
Glad you liked it, David.
@MrMeik1970
@MrMeik1970 3 года назад
once again a pleasure to see what kind of treasures you have on the table. i like the new intro too.
@UncleDoug
@UncleDoug 3 года назад
Thanks, Meik. Glad you like it :)
@choimdachoim9491
@choimdachoim9491 3 года назад
Reaching in to turn off a switch when something is going wrong takes resolve. My old computer got rained on outside, I let it dry out in the house for a couple days and when I plugged it in it sounded like it was going to explode...I jumped across the living room to dive out the second-story window but stopped myself and bravely ran back to unplug it. I then went to the window to catch my breath and looked down at the rocky cliff I would have landed on...definite turning-point in my life. It's all fun and funny when you survive.
@UncleDoug
@UncleDoug 3 года назад
I am braver when a customer's amp is at risk. The thought of having to tell them it went up in flames is worse than actually being engulfed in those flames ;)
@choimdachoim9491
@choimdachoim9491 3 года назад
@@UncleDoug good laugh !
@PhuketMyMac
@PhuketMyMac Год назад
Thank you uncle Doug!
@UncleDoug
@UncleDoug Год назад
YW, P ;)
@romannumeral5547
@romannumeral5547 2 года назад
Many thanks Doug for the wonderful video. As usual it's full of great advice. Your knowledge and humour are greatly appreciated.
@UncleDoug
@UncleDoug 2 года назад
That's great to hear, RN :)
@JC-11111
@JC-11111 3 года назад
I'd love to have one of those JTMs 🙏👍
@UncleDoug
@UncleDoug 3 года назад
Me too, JC.
@tomstiel7576
@tomstiel7576 3 года назад
man I was worried about you and the critters,,,,welcome back fellas,,,another enjoyable video experience,,,,if my cat had thumbs he would give 2 up
@UncleDoug
@UncleDoug 3 года назад
We'll settle on 2 dew claws up, Tom. Thanks !!
@PrinceOfBodom
@PrinceOfBodom 3 года назад
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.
@UncleDoug
@UncleDoug 3 года назад
Thanks so much, PoB :)
@raycochrane3971
@raycochrane3971 3 года назад
The Return of Uncle Doug: you were missed. Another classic problem solving episode. THANKS.
@UncleDoug
@UncleDoug 3 года назад
Our pleasure, Ray. Thanks !!
@grahamhall2662
@grahamhall2662 Год назад
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.
@UncleDoug
@UncleDoug Год назад
Thanks, Graham. Yes, the load resistance can be readily changed.
@elbowjames7625
@elbowjames7625 2 года назад
I was just noticing that the tube retainers are of more recent vintage than originals which would have been those funny looking knitted bonnets like tea cozies. I think they were fiberglass. I do remember being amused the first time I saw them, I pictured little old grannies knitting away in the Marshall factory making "valve bonnets"!
@UncleDoug
@UncleDoug 2 года назад
Thanks for the info, James :)
@vanceerickson2538
@vanceerickson2538 3 года назад
I don't know what he did, but the audio quality of Uncle Doug's videos has improved hugely. I used to watch him put together a beautiful old amp (and learn an enormous amount), then be really disappointed at the rattly, crunchy sound of the demo. No more! Maybe Jack and Ollie have sharpened up their chops!
@UncleDoug
@UncleDoug 3 года назад
Jack & Ollie are always at the top of their game, Vance, but your old Uncle has been upping the kbps and asr parameters in the audio processing program.
@vanceerickson2538
@vanceerickson2538 3 года назад
@@UncleDoug Thank you for that. It makes your videos even more of a pleasure to watch.
@martynh00
@martynh00 3 года назад
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.
@UncleDoug
@UncleDoug 3 года назад
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 :)
@PandemoniumMeltDown
@PandemoniumMeltDown 3 года назад
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
@UncleDoug 3 года назад
Wow....thanks so much for all the very nice comments, PM. We really appreciate them and will definitely keep at it :)
@beachcomber2008
@beachcomber2008 3 года назад
More to the point than I could have been.
@Tom_Emody
@Tom_Emody Год назад
Sweet montage at the beginning of the video.
@UncleDoug
@UncleDoug Год назад
Thanks, Tom :)
@Ireland831
@Ireland831 Год назад
Block end JTM45 chassis! Wow...I want one!
@UncleDoug
@UncleDoug Год назад
Apparently they are rather rare :) I hope you find one, Ireland.
@brianm9282
@brianm9282 3 года назад
It's rainy and gloomy in Chicago but this is a ray of sunshine!
@UncleDoug
@UncleDoug 3 года назад
Close the curtains and bask in the glow of your computer screen, Brian :)
@gregj.gotham4402
@gregj.gotham4402 10 месяцев назад
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.
@UncleDoug
@UncleDoug 10 месяцев назад
You're quite welcome, Greg. Thanks for your very nice comments :)
@brianhoffeller3876
@brianhoffeller3876 Год назад
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.
@UncleDoug
@UncleDoug Год назад
Thanks, Brian :)
@davidskolnick5077
@davidskolnick5077 Год назад
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.
@UncleDoug
@UncleDoug Год назад
Thanks for the helpful tip, David.
@murphyr31
@murphyr31 2 года назад
No substitute for accumulation of knowledge … well done sir!
@UncleDoug
@UncleDoug 2 года назад
Thanks, Richard :)
@mobicus1
@mobicus1 3 года назад
Thanks for another awesome video Uncle!
@UncleDoug
@UncleDoug 3 года назад
The pleasure was ours, Rick. Thanks for watching :)
@davidklang8174
@davidklang8174 3 года назад
MacGyvering the Erie cap was total madness. Bravo.
@UncleDoug
@UncleDoug 3 года назад
Agreed, David, but trying new things makes life interesting :)
@Byron_Blue
@Byron_Blue 3 года назад
Very nice work Doug! The extra effort of installing the replacement cap inside the can is inspiring…
@UncleDoug
@UncleDoug 3 года назад
Thanks so much, Byron.
@southboundsuarez9832
@southboundsuarez9832 3 года назад
Yeah I like stuffing caps!
@randygraff2825
@randygraff2825 Год назад
I'm glad I found your Channel love watching you explain things your knowledge inspires me as I have interest in vintage electronics. Thank you for the professionals videos you show.
@UncleDoug
@UncleDoug Год назад
You're welcome, Randy.
@antoninowoodystella4607
@antoninowoodystella4607 2 года назад
you are the best teacher
@UncleDoug
@UncleDoug 2 года назад
Thanks so much, Antonio :)
@udr3005
@udr3005 3 года назад
Uncle, you are a genious.
@UncleDoug
@UncleDoug 3 года назад
You are too kind, Ulrich.....but thanks ;)
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