100k Ptrim buzz

[PT]

Hello,

Just finished my Kaiju, question about 100k Ptrim pot adjustment:
I get no buzz when its towards the very left or the very right. Mid adjustments give me 50Hz Hum - is that normal operation, or I should look for a bad ground somewhere? Both Left and Right channel, voltage checks along the way of assembly are fine. There was a 50Hz buzz from the system before the DC filament upgrade, now its quiet with a hint of hiss..

[Paul Birkeland]

I would just leave the trim pots all the way up if that's the case in your system.  There is likely an interaction at work that you could chase down to address this, but I would only go down that road if you absolutely have to have those trim pots cranked down.