First of all, I had a very busy week so no time were left for these kind of activities x(
I did, however receive those brand new 50+50 caps but I will change them once we pin out what the problem really is so the new ones don't get burnt - unless you want me to replace them..
This is measured at the point where the red cables enter the power section at the far most south-east.
Main filter caps
Green to blue cable: 347VDC
Green to yellow cable: 491.5VDC
This is measured on the one to the south. I did get my new multimeter and now when I measure it seems values aren't as jumpy as before.
Bias voltage (correct me if I measure it wrong here)
R26-27(common point) -> Ground: 4mVAC
It counted downwards from about 1VAC after power on.
How do I measure bias voltage at each tube grid pin? I recently measured between pin 2 & 7 on all EL34 sockets. Is that what you're after?