Tube Amp Archive

Thanks! The plug is a real puzzler.

How do you like the OPTs on these things? Pretty good sized, are they 20 to 20K?

Thatch

A lot of the old portable Ampex pro Reel to Reel had preamp heads that come right out of the recorder. Stereo, uses 2 mikes, is tube and probably just needs a diode to replace the selenium. They sell on the big online auction and maybe still under $300. Tube mike preamps are the way to go since you ...

I decided to just leave the thing alone and try to sell it. I pulled the socket top back and sure enough it was wired as described by Paulster even though it still had the 230 plug. Go figure. I was going over the thing pretty close and found those magic words Western Electric almost hidden under th...

You can't just plug in a 50 year old piece of gear without warming it up on a variac. Well you can, but if it isn't ruined before chances are any caps not shot already will be after, and the ones you want the most will be the 1st to go, meaning the power supply filter caps. I am not a musician but n...

I seem to have stumbled across a very interesting amp that might be wonderful for guitar but am not qite sure what to do about it. It has Bell Labs steel, is a PP 6550 with a 6V6 driving them and has other amplifier input tubes and a pair of 5V4 GT rectifiers. I managed to get a schematic of it and ...