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72.49.30.37
Hello, I've found this... "Amp" in a room of a house that I recently purchased, and I do have a pretty good handle on electronics, myself. I was thinking that I could get it in order. The thing is, it has no manufacturer's name, but it looks like a clone of an early Marshall. The power cable is... An XLR Microphone cable?
I actually have an old Sencore tube tester, and all of the tubes test fine. It's draws about 80 watts at the wall, with the power switch on, on standby. Turn the standby switch to play though, and it instantly glows the power tubes bright blue and screems extremely loudly, no matter if there is an instrument plugged in or not, or the positions of any knobs. If you strum the guitar plunged into it, with the knobs at 50%, you get a quarter of a second of beautiful tone, and screech. Also, draws over 2 amps at least.
So... Any ideas? 2 12ax7 and one 12au7 in the preamp, 2 MESA el-34 power tubes.
Follow Ups:
that is pretty cool. I've heard amps do that when the output transformer was wired with the output wires reversed going to the power tube. you could try to reverse em and see if it gets better. It looks like maybe it's a take on a Marshall 2204 JCM 800 with a tube rectifier added.
The back half...
Another photo...
Do you have the schematic.
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