Tube Amp Archive

Good to know, thanks!

Well, I finally got around to ordering a replacement choke. One (hopefully not too dumb) question: is there a directional flow to these, i.e. does it matter which one of the 2 wires is connected to one point or the other?

I didn't see smoke when I had it open, but there was a sizzling sound - the wrap around the xformer core (paper?) was bubbling at the edges. I'm assuming this was due to excessive heat, and it would likely have smoked if I'd left it on. I really didn't want to test that theory, though.

well...did the cap mods, and the amp sounded good - for a few minutes. Except, there was this occasional dropout, like a little click & then the amp comes back. :? Suddenly, no sound...and smoke starts drifting up. :shock: I kill it in a hurry, and opened it up again. Not seeing anything burnt...so ...

Re: the filter caps - I didn't think they would do much for the bright tone, otherwise I would expect the amp to sound better already. The dual caps are already there, put in by a previous owner. I was just trying to understand why he did it, and also wondering if a change that large might be detrim...

Yeah, I was pretty sure you were familiar with that page from your other posts. ;) I also have a couple caps for the cathode bypass - same 25uf value he suggested. I'm interested in the tone stack thoughts too - I will try bypassing the filters per your suggestion & see what I have, and then try fid...

double-post'd...

I'm also planning on replacing the speaker at some point - probably going to stick with the 10", as I already have a 12" combo. Nothing is set in stone, though...

Tonewise the amp is too bright. It was helped a bit with some newer preamplifier tubes - seems to have a stronger midrange now. I plan to do some simple mods first and see where that gets me. Yes, it has the .0047 mystery cap. I'm going to raise it up to .015. I picked OD caps because the guy who di...

Excellent info - thanks!

Hi! I ran across this place searching for info on the GA-15rvt, one of which has just come into my possession. I saw a recent thread here, which echoed some cap mods & such I'd seen elsewhere, but being a bit of a n00b at amp tinkering I wanted to ask if someone could give me a little more detail. F...