Hello.
I'm a relative beginner to amp repair, but I've gotten pretty comfortable inside of tube amps. I don't know the first thing about solid state, though. What better way to learn than just to dive in?
I bought an old Ampeg GT10 (schematic attached) that has this really faint distortion that sort of sits on top of a note. It's tough to describe, but it's not like the note itself is distorted, it just has this "fizziness" that follows it, and is most apparent when I let a note ring out. It occurs at any volume. It almost sounds like a problem with the speaker, but I've tested the amp with a known-good speaker in a different cab, and the problem persists.
Just as a blind guess, I went ahead and replaced the filter caps - C30 and C31 on the schematic - as well as C29. No change. Can anyone suggest a potential next step?
I'm a relative beginner to amp repair, but I've gotten pretty comfortable inside of tube amps. I don't know the first thing about solid state, though. What better way to learn than just to dive in?
I bought an old Ampeg GT10 (schematic attached) that has this really faint distortion that sort of sits on top of a note. It's tough to describe, but it's not like the note itself is distorted, it just has this "fizziness" that follows it, and is most apparent when I let a note ring out. It occurs at any volume. It almost sounds like a problem with the speaker, but I've tested the amp with a known-good speaker in a different cab, and the problem persists.
Just as a blind guess, I went ahead and replaced the filter caps - C30 and C31 on the schematic - as well as C29. No change. Can anyone suggest a potential next step?