So with 120vac input with the bucking connection, and the rectifier pulled I get 6.48-6.5 volts for that heater winding. May as well leave it that way.
With the amplifier powered/warmed up with 120vac input, I get a B+ of 370 volts. The screen voltage is 365 volts, with the 6EU7 filter cap at 335. The cathode voltage between each pair of 6BQ5/EL84 is 16 volts.
Plate voltage for each section of 6EU7 for each side is 185/186 for the left side 6EU7, and 176/175 for the right side 6EU7.
Swapping the right side 6EU7 for another 6EU7, I still end up with a 10 volt plate voltage difference between the left and right side...dunno really why...Maybe a wiring error?
These are used 6EU7 tested on a no-go gauge emission tester.
The cathode voltage for each 6EU7 is at 1.5 volts.
I have a quad of old well worn Mullard EL84 for output tubes, which are sorta (not) matched...well, they looked good on the no-go gauge...
The best I get between each pair, (with some swapping) is 42 millivolts for the left side, and 38 millivolts on the right.
I have other 6BQ5/EL84 to swap in to see if I can get 44 millivolts between each pair.
I'm measuring voltages using 8 ohm load resistors.
Mike