Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: pbman1953 on August 31, 2013, 06:19:58 pm
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I'm giving this some more serious thought compared to the past.
The Amp has 3- 12ax7's and 4- 6KG6 tubes that are only available from Russian vendors and there's no way that any of the so far can match a set.So I have to get pairs here and there and get lucky with matching.
Here's the map-http://www.freeinfosociety.com/electronics/schematics/audio/traynor_customspecial_yba3a.pdf
I'm told that the transformer was specially would for this power tube , which was a horizontal TV tube. I guess Pete Traynor had to be different.
I'm thinking of going to KT-88's or possibly the newer KT-120's. I hear good things about them
Every one says that it's an expensive project. The main question is if the transformers are able to be used. If I have to change them out then I'll not go forward and possibly sell the amp. It's not that I'm unhappy with the amp it's that recently I picked up a Fender/Sunn 300T, previously owned, and realized what I missed. Plus I have a Sunn 2000s also.The Traynor has a forward focused sound where the other 2 warmer.
So as far as the expense:
If it's go and besides the 4- tubes I need and the tube sockets, would there be an extensive parts list of just re-wiring labor? I'd go for a second bias pot. How many labor hours are we talking here?
Thanks
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There seem to be plenty of those tubes around and the don't look that expensive. I think you start pulling on the Kt-88 thread and you'll be pulling for a long time. Why not just get some new tubes and see how it sounds?
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Does anyone know the impedance of the primary of the output transformer ?
this would help a lot in finding a replacement tube
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Those tubes requires particular low screen voltage and so they use "special" PT
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The simplest solution may be new JJ EL509 (also if a socket substitution is required)
http://www.hifitubes.nl/weblog/wp-content/jj-electronic-el509.pdf (http://www.hifitubes.nl/weblog/wp-content/jj-electronic-el509.pdf)
Here you can find also matched
http://www.thetubestore.com/Tubes/Big-Power-Tubes/JJ-EL509-S (http://www.thetubestore.com/Tubes/Big-Power-Tubes/JJ-EL509-S)
(http://www.freewebs.com/antreas555/GU84%20003.JPG)
K
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Tube wise, I just had it set up with a very reputable tech . The tubes in there now are a pair of Sylvania's and a pair of winged C 6P45S. maybe that it's the Traynor
"sound" that;s getting to me compared to using my Sunn type amps. The sustain on the Fender/ Sunn 300T and the Sunn 2000 will go on for days
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Maybe you leave it stock and just consider it another part in your sound mix? Or maybe it takes pedals well? Think about the possibilities -- assuming you have a strong back. I have a couple of Traynors and I've played a Sunn, can't remember which model. I think they're different enough animals that making the one sound like other would be a challenge.
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Thanks, but I don't think a pedal would help
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Will the JJ sound like a 6Kg6/ el 509?