New Princeton Reverb build--Low B+ post -GZ34

[ViperDoc]

CHOPSTICKING FOR THE WIN!

I'm not sure if I'm out of the woods yet, but I found my adjustable NFB resistors were uncomfortably close to a ground tab. I moved them and now the amp, as far as I can tell, sounds great. I'll give it a more thorough run-through for sure.

I had hoped to record the outage I was hearing and recorded a whole new noise issue instead. If you're interested, here's what it sounded like before and after, complete with unpolished guitar :

Before chop sticking (BONUS: hear the difference in minimum tremolo speed between stock bypass cap and a red LED):

PR2 Weird Sounds.m4a

After chop sticking (BONUS: Hear different pickup/NFB settings while pushing the PR circuit--no pedals, just the amp):

PR2 After Chop sticking.m4a

All of your help is indeed much appreciated. Looks like I may have a spare PR OT for another chassis.

[martin manning]

Nice, hope you've found it. The trem sounds great! The bias varying system is dependent upon where the bias is set, as you found out, but when adjusted properly it produces a better effect than the neon/LDR IMO. It came in with the '63 Vibroverb, and the PR was the only BF amp that kept it AFAIK.

[didit]

Nice, hope you've found it. The trem sounds great! The bias varying system is dependent upon where the bias is set, as you found out, but when adjusted properly it produces a better effect than the neon/LDR IMO. It came in with the '63 Vibroverb, and the PR was the only BF amp that kept it AFAIK.

That does now sound great, tremolo and all. Vibro Champ might qualify though it's bias vary in the second preamp section.

Best .. Ian

[martin manning]

Vibro Champ might qualify though it's bias vary in the second preamp section.

Best .. Ian

Ok I stand corrected... PR is the only PP amp with bias vary trem ;^)

[ViperDoc]

Thanks, guys!