Tube Amp Archive

The test was somewhat subjective, I adjusted the function generator amplitude while looking at the output voltage. I could throw it on the distortion analyzer if interested, to see what kind of output we get at 1, 5, 10% THD for example

Alrighty, so I did a bit of work tonight - reduced the preamp oscillations and did the power test. I'll say this amp was trickier to tame than I expected considering it only has three gain stages, I wouldn't recommend beginners attempt to build unless they have a known working layout and some lead d...

Got the amp wired up last night, it’s pretty dang loud LOL. I have the output tube biased on the coldest setting, and was using it with a Two Notes Torpedo Captor with a cab on the -20 dB port. Sounds pretty unique I’d say, it does really good with high gain. I wasn’t expecting to be able to get met...

Thanks for sharing Mark, I love the voltage chart! Great info in there so I know what to shoot for. Unfortunately the tube-town PT shipping cost is prohibitive where I'm located, but I did order a 272JX over the weekend so it looks like I'll be making two Expresses. In another thread a member report...

I made an impulse purchase of the Pacific PAM-PT-30-54R and PAM-OT-30-54R, and now I'm embarking on my first Trainwreck build journey. I didn't look very closely before purchasing and now I have a couple concerns. The OT shows 7.5k primary, which looks a bit high. I'm not terribly worried about this...