Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Natelc1979 on May 13, 2024, 08:38:18 am

Title: Gibson Thor mod help
Post by: Natelc1979 on May 13, 2024, 08:38:18 am

I picked a Gibson Thor bass amp up really cheap at a garage sale. I replaced all the tubes and got it working, but I’m want to use it with guitar and I’m new to this stuff and I’m wondering if anyone can tell what needs changed to make this amp good for guitar. I attached the schematic

Title: Re: Gibson Thor mod help
Post by: shooter on May 13, 2024, 09:19:58 am

speakers, as many different one's you can beg borrow....
pickups, play through different guitars
pedals, as many different ones you can....scrounge.


now you are set to "understand" what you want the amp to do, for You.
then we can talk about tweak'n an R, a C.....

Title: Re: Gibson Thor mod help
Post by: sluckey on May 13, 2024, 09:32:26 am

Yes, try a guitar speaker first. If no joy, replace the tonestack as per the attached drawing.

Title: Re: Gibson Thor mod help
Post by: idsnowdog on May 14, 2024, 07:21:13 am

It isn't that different from a guitar amp.  The values in red are normal for a guitar amp.  You could duplicate the V1A cathode resistor and capacitor combination on V1B.