[terrylett]

Well the thing is I swapped out multiples of ALL the tubes, replaced all the resistors and capacitors so even if I found a unacceptable voltage what would cause it?

Also what would fix it?

I put in another 20 mf electrolytic with + end on pin 4 of 50L6 and - end on B- and I still get a low hum.

I have another speaker/transformer assembly from a different Hippo project and it is an exact match.

I suppose I could install it to see if that helps...