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In Reply to: RE: I feel for you on this amp. posted by airtime on June 18, 2016 at 07:26:13
The previous owner had replaced all the caps, resistors and transistors on the driver board. So far so good, no bad noises for 6 hours of use. usually the crackling noise would show up after about 20 minutes of warm up. I'm confident I have found the area on the board that was causing the noise, if it comes back I can try and clean it up a little better. Need to get a good magnifier and a very small file.
Thomas
Follow Ups:
The problem would appear in 30 minutes or it could appear hours later.You say he replaced all the transistors and still had the issue? That board is very populated with parts and it is very hard to get the parts out..Had I had my pace soldering station at the time,I'm sure it would have gone smoother.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
I think the best thing for that amp is to leave it alone.
Like working on NAD boards. You get one shot and some times even that doesn't go well.
I agree
Intermittent problems can be horrible to find,especially in over engineered circuits like the Transnova.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
I use this and it works very well.
If it ain't broke then just leave it. Seems too many people have already had there hands on those boards. SO it looks like they will not take much more. Try not to mess around with the board coatings. That is what is supposed to keep the solder from "shorting" out trace leads.
If it's working then just leave it.
But great job finding the problem. Hope it never returns. If you really like the amp consider having it PROFESSIONALLY restored. I think Mike does only tubes. But you could ask him for a reference for a restorer. BTW Mike is the best in the business!!!!!!! As well as one of the worlds nicest guys. Also Jim McShane is another one to contact. Also a hell of a wonderful guy.
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