This is the amplifier that i found that have the most tremendous bass response below 10-15Hz at low listening levels, if you touch the speakers cabinets, or the wall or doors of a small room, you can feel the vibrations.
I broke the one my father gave me when i was younger playing with an Ameter trying figuring how to measure this thing that is the bias...
Have made a mistake, stupid move of shorting point 8C if i remember correctly of one of the board to the ground, maybe the Ameter fuse or other have blown preventing more damage i don't remember.
What i did after is removing the output transistors, (they were not all originals, and lost them since i have fired up without them and try to measure voltages, another minor incident happens, the probe toutched two points at the same time, just on the upper of point 8C and a voltage at one point have change a little bit.
I notices that one of the two 3W ceramic 180 ohm resistor under the amplifier near the back is shorted and the fuse bulb stay on because of this resistors i think.
I think this amplifier deserves a little overhaul, i think i have some resistors so i will replace the faultly, thinking of buying transistors and a variac, build a dim bulb tester...
Or maybe let the work to a repair shop or someone close to Montréal / Lanaudière area in QC Canada.
I have not found anywhere, but not searched for some time, the proper and well explained way to adjust symmetrical output (since this is a capacitor coupled output design) and bias.
If i do myself, i will scratch my head more than the first time i played with it...