Found this previous post of Mark's. Will now try without dim bulb.
on DBT:
before power, VR3, VR4 fully CCW
turn on power, warm up time
pots on the power supply adjust to +58 and -58v
read p.s. pin 4 voltage to ground, set p.s. vr1 to +58v
read p.s. pin 5 voltage to ground, set p.s. vr2 to -58v
All the 8.xxx stuff is in the manual. Page 20 of the paper manual that was scanned, pages 18 and 19 of the 61 page pdf file.
8a obvious - has to be open...
8b VR3, VR4 fully CCW
8c warm up time
8.1 ignore, leave it at normal
8.2 ignore, volume control to minimum, that 's the infinity symbol when fully CCW
8.3 ignore
8.4 ignore
8.5 DO
8.6 DO
WHEN we remove the DBT, the above will change and has to be redone.
Tickling the dragon's tail:
This is a TRIAL set of the idle current for each channel, to tease out any faults while STILL on the DBT. You might NOT make it to 0.050VDC on each channel - that's fine as long as there is SOME idle current and it is adjustable.
The idle current will cause the bulb to glow a bit brighter, if you have strange things happening, you probably need some more wattage on the DBT.
FULL ON BRIGHT would be a fault, and you would stop.
8.7 DO
turn idle current VR3 adjust BACK to fully ccw
8.8 DO
turn idle current VR4 adjust BACK to fully ccw
now, plugged DIRECTLY into the power line:
before power, amplifier VR3, VR4 fully CCW
turn on power, warm up time
pots on the power supply adjust to +58 and -58v
read p.s. pin 4 voltage to ground, set p.s. vr1 to +58v
read p.s. pin 5 voltage to ground, set p.s. vr2 to -58v
then follow the procedure
8.1 ignore, leave it at normal
8.2 ignore, volume control to minimum, that 's the infinity symbol when fully CCW
8.3 ignore
8.4 ignore
8.5 DO, target = 0.000VDC
8.6 DO target = 0.000VDC
8.7 DO target = 0.050VDC
8.8 DO target = 0.050VDC