Tube Amp Archive

Or so it seems, the amp owner just bought another new tube, put it in and no noise has occured.

Damm if it starts bothering again I´ll tell that guy to take the amp to a Shaman.

Done! at last. After having done anything possible, including new tubes, I decided to try out old tubes from a friend´s amp just to see what happened. With awe and disbelief, I noticed that as soon as I replaced the Rectifier tube the problem stopped. I put the amp´s old tube back in, and then the n...

Thanks mates. Actually I´ve played the amp through my own 4x12 and 2x12 cabs, the problem remains the same regardless of the cab it is played through. Honestly I didn´t check the housing of the amp, only the speakers, cause it gives me the exact same problem with other cabs that I´m 100% sure they a...

Thanks mates. Actually I´ve played the amp through my own 4x12 and 2x12 cabs, the problem remains the same regardless of the cab it is played through. Honestly I didn´t check the housing of the amp, only the speakers, cause it gives me the exact same problem with other cabs that I´m 100% sure they a...

Hello mates. Lying flat on my bench is a Marshall 50w JTM Model 1962 Bluesbreaker reissue made in ´94 It has a rattling sound when you play low notes, specially the 6th string. It sounds as if it was a broken or torn speaker, but speakers are fine (they´ve been tested, and so the amp with other spea...

Problem solved mates.
Bloody FET was the culprit!

Thanks a lot mates!!!
This one got me thinking for hours.

Cheers

I just worked on a TSL 100, similar amp. Anyway, I found several shorted small bypass caps/ I don't know why Marshall did this but they bypass several of the Power supply caps with little disc caps of like 10pf or 22pf. They are of poor quality and short out. Odd thing is some of them are not even ...

Hi mates, this is my first post here, I hope I can get help and help others too. I have a JCM2000 TSL-60 on the bench, the individual channel volumes for both od1 and od2 channels don´t work at all, the master volume and the clean channel volumen do work perfectly. There are bo noises, or lack of di...