well, that was it…output transformer wiring swap.
Let that be a lesson to anyone building the two stroke amp with the Weber WSE15…don’t follow the instructions from the book – the WSE15 swaps the blue and brown wires from the way the Hammond 125ESE has them…
Squeal is completely gone. haven’t tried other tubes but the amp works perfectly with a 6v6 into the single 12″ 8 ohm and the single 8″ 16 ohm speakers individually.
some hum came back, but i also snapped the heater connection lug for pin 2 on the output tube socket and did a crappy job of reconnecting as i could with only some solder. hopefully a permanent fix of that should tame the hum.
thanks to all who helped.