r/tubeamprepair

I bought the amp in roughly 96ish and have changed the power tubes once. Lately what I have been experiencing is the volume will cutout. Plus the amp breaks up at low volumes.

It has been maybe 15 or so years since I changed the power tubes.

So I ordered new power and preamp tubes. I replaced the tubes and it breaks up worse than before. Normally this has a great clean tone and I can set the volume to 5 and it stays fairly clean with a normal string attack.

I plan to put the original preamp tubes back in and see if there is a change in sound. The original and the replacement preamp tubes are 12ax7. The new tubes were purchased from the tube store. I bought JJ tubes.

Looking for advice on how to proceed in troubleshooting this issue.

Title,

Thanks

I'm dumb, I don't know how to fix tube amps. I can solder and I listen to podcasts and read books, but that's it. I'm not smart enough to be able to study the schematics and see tiny changes, only big ones like tubes and pots and transformers. I know, I know, I could REALLY study them to see the differences but remember how lazy I am; I don't want to start pulling chassis.

I've got the OT list, got the PT list, got the schematics links, but I cannot find anywhere that just lists amp circuits by year. We know how reliable tube charts are. I'm trying to get the circuit of a 1970-1971 Twin Reverb. Those all look so similar and there's so much going on (to me!). I would also like this list for other reasons, all having to do with laziness.