Tube Amp Archive

Are you sure that it isn't the guitar? :?: If it's the same problem with all of your amps, and there's no hum without the guitar plugged in, then that's what I would suspect. See if you can borrow another guitar to try. Alternatively, try a new (shorter) cable. It could be picking up radio interfere...

Hi, I am planning something similar, and I think you can run the transformer backwards, from a 6v supply, to get the B+. The 6v supply powers the heaters. Here is a link: http://www.jjs.at/electronic/class_ab_subminiature.html Look at the power supply section. If you want a lower B+, then use a tran...

Hi,
I'm thinking of building my own version of this, and I'm planning on using a cathodyne PI to keep if down to 2 tubes. Do you think that it would make a large difference to the sound? I know it would have slightly less gain, but that's OK with me.
By the way, yours looks fantastic!
Daniel