Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: RobBozic on December 21, 2012, 10:19:01 pm

Title: AB763 - Reverb return to PI
Post by: RobBozic on December 21, 2012, 10:19:01 pm

Hi guys,

Can someone tell me how returning the reverb signal to the 100n PI (pin 7) input affects the tone in a typical blackface style topology?

Thanks
Rob

Title: Re: AB763 - Reverb return to PI
Post by: Willabe on December 21, 2012, 10:32:01 pm

I'm not sure you can because AB763 has the NFB on pin 7 of the PI tube.


                     Brad      :think1:

Title: Re: AB763 - Reverb return to PI
Post by: RobBozic on December 22, 2012, 01:23:53 am

Oh yeah, I forgot about the NFB.  :think1: Anyway if there wasn't any NFB, would there abenfit to returning the reverb to pin 7 via the 100n cap?

Thanls
Rob

Title: Re: AB763 - Reverb return to PI
Post by: tubeswell on December 22, 2012, 06:35:18 am

I also added some other considerations on your post over at ampgarage