Tube Amp Archive

Maybe? they're white tubes? I haven't left the heat on long, but maybe they did melt a bit, who knows. I might have another lying around, or can just change the value a bit. I was told anything under 10ma isn't really a problem.

Yes, I replaced the cap. the new one (actually new, not used) still is letting 25ma through. Their both Mallory 150's, I think i have one more to try, but isn't Mallory normally better about that?

ok, voltages were the same without tubes: 420v at all nodes on the Goodsell, on the build voltages went down 1v at every node. popped the tubes in from the Goodsell. sound is very bad, measured coupling caps off the PI and one had 35ma on backside, also the wire from the pot to input cap on PI is os...

Good call, I'll try that right now, I'm at the bench.

Tubes are the same in both amps, but I'll try it actually using the goodsell tubes in the build. I DID pull both the 3k resistors and test them, both were right on. It's a part for part build, maybe it's as simple as a bad tube?

Hey all, I'm working on a small wattage amp with old Hammond iron from an M-100 organ, based on a Goodsell Super-17. The secondary from the PT is running through a solid state rectifier (2 diodes) to a 50uf, thru a 3k/50uf R-C, then thru a 10k/22uf R-C. The question I have is: I'm seeing 362v at the...

How would I check the filter caps? Or should I just change out the ones before preamp supply node? I'm planning on changing Rec tubes anyways, so I'll be able to check that.

Hey all, I have a Ceriatone DC30 that has started to sound a bit over-compressed on the first channel. To be specific, when I hit a big chord it sounds big and open for about half a second then audibly "ducks", almost like it hit a big limiter and it clamped down. There are 2 12ax7 tubes, and I've t...