Thunderbass serial 6840

[jimcorliss]

just bought a Thunderbass serial 6840. Any schematic or instructions and any information appreciated. I’m not firing it up until I look inside and see if it still has wax caps. The cord needs replacement as it looks like a lamp cord someone put on . One Treble knob is missing if anyone has one . l’ll snap a picture.

Thanks !

 

[jimcorliss]

 

[GGJaguar]

Welcome to LTG! You can find schematics here:

Prowess Amplifiers - Misc Schematics

www.prowessamplifiers.com

From the rust on the chassis and xfrmrs it looks like the amp was stored in a damp basement. Good luck with the restoration!

 

[jimcorliss]

Thanks ! It works ! One 6l6 tube only had 2800 Mu, the other 4900 (should be 5000) I had a pair matched and placed them in. I don’t like the numbers I’m getting on the bias so will have to look into the resistor values. Still lots to do but good start. I warmed it up incrementally over an hour with a Variac. Just learning this stuff .