Hi Guys,

Thanks for that guidance.

Okay, I'll look into the best point to put a bleed resistor in but for now I've been successful on draining the filter caps, and pulled the chassis out and buzzed out the circuit.

I found the culprit being the bridge between pins 8 and 3 on the 12AY7, there was a loose connection there.

It also gave me a chance to check and recheck all of the solder joints and reflow a couple that I did not like.

All voltages are reading within their tolerances except for one being the PI grid leak from the 1M resistor going to pin 7 of the 12AX7.

Apparently its supposed to be 19V and its reading 2.71V which is quite low.

I can't for the life of me figure out why, except that the carbon comp resistor may be not within specs. I was actually quite surprised at how inaccurate the carbon comp resistors were wiht tolerances. I think if I build one again it would be with a turret board and metal film resistors.

Anyway, all input channels are working perfectly and the amp sounds and feels amazing.