Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: bbirling on June 13, 2011, 09:12:41 am

Title: Fender Twin on the bench with bad hiss.
Post by: bbirling on June 13, 2011, 09:12:41 am

I have fender twin in for service that has a bad hiss. With V4 or V5 pulled the hiss is gone. So far I have tried new tubes and changed out Plate resistor on V5. Any help would be appreciated. I have to link to the schematic since it's to big to post.

http://support.fender.com/schematics/guitar_amplifiers/Twin-Amp_schematic.pdf (http://support.fender.com/schematics/guitar_amplifiers/Twin-Amp_schematic.pdf)
Bruce

Title: Re: Fender Twin on the bench with bad hiss.
Post by: EL34 on June 13, 2011, 05:18:40 pm

Sounds like you need to do a service on the amp
Servicing Fender amps (http://www.el34world.com/schematics.htm#Servicing fender amps)