Peavey 6505+ head, signal bleed in lead channel at 0 master volume

[lunchbox21]

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!!!

[shooter]

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

[Lauri]

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