Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: joesatch on January 30, 2022, 09:58:19 pm

Title: potential Hoffman Princeton Reverb build
Post by: joesatch on January 30, 2022, 09:58:19 pm

Looking at putting this together it looks cleaner and and more efficient than putting an ab763 together. I would however use a bridge rectifier and 6L6 tubes. I also want to see about adding a Mid pot as well. As long as i spec the PT for this are there any issues with my plan? How would i go about adding the Mid pot?

Title: Re: potential Hoffman Princeton Reverb build
Post by: thetragichero on January 30, 2022, 10:14:43 pm

i don't have the schematic pulled up but my wild ass guess is that there is a resistor from the tone stack to ground (i wanna say something like 6k8ish?). replace that with a 25kB pot wired as a rheostat

Title: Re: potential Hoffman Princeton Reverb build
Post by: Stuff4bikes on January 30, 2022, 11:29:57 pm

Quote from: thetragichero on January 30, 2022, 10:14:43 pm

i don't have the schematic pulled up but my wild ass guess is that there is a resistor from the tone stack to ground (i wanna say something like 6k8ish?). replace that with a 25kB pot wired as a rheostat

That's what I did except with 15k.........

Title: Re: potential Hoffman Princeton Reverb build
Post by: PRR on January 31, 2022, 12:11:22 am

https://robrobinette.com/AB763_Model_Differences.htm