Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: lunchbox21 on February 20, 2025, 06:25:34 am

Title: Peavey 6505+ head, signal bleed in lead channel at 0 master volume
Post by: lunchbox21 on February 20, 2025, 06:25:34 am

Hi all,

I got the peavey 6505+ for 420€ used.. Only issue i am having is the lead channel where i can hear signal even at zero master volume ('Post')

Here is the clip of what i mean (sorry for the bad recording):

I have changed almost all the preamp tubes including the V3.

Any help will be greatly appreciated :)
Cheers!!!

Title: Re: Peavey 6505+ head, signal bleed in lead channel at 0 master volume
Post by: shooter on February 20, 2025, 08:20:01 am

here's the schematic, maybe,  I had 30 seconds free time, switching circuit would be my 1st rabbit hole.


https://el34world.com/charts/Schematics/files/Peavey/Peavey_6505-20MHC.pdf

Title: Re: Peavey 6505+ head, signal bleed in lead channel at 0 master volume
Post by: Lauri on February 20, 2025, 08:50:33 am

I would start with checking if VR10 lead post potentiometer works properly. Measure if there's any resistance to ground from the center lug of the pot when it's fully turned counterclockwise. Next suspects are the filter caps for the preamp stages, C36, C37 and C33.

Here's the schematic
https://el34world.com/charts/Schematics/files/Peavey/5150_2.pdf (https://el34world.com/charts/Schematics/files/Peavey/5150_2.pdf)