ALL LOW VOLTAGE SUPPLY LEVELS ARE GOOD
The LV power supply produces a range of voltages for the digital logic, memory chips, analog logic and to power the High Voltage (HV) supply. I verified the presence of +5, -5, +8.5, +8, -12, -44 and +44 VDC as well as the 6.3VAC for the display tube filament.
SOME OF THE HIGH VOLTAGE IS WORKING BUT NOT ALL
The HV power supply produces voltages such as 400V for accelerating the electron stream towards the front of the screen - those are present. However, the tube needs a really high voltage to produce a nice bright image on the phosphors. The supply is NOT producing the 18,000V which is why the tube isn't showing anything.
NO SCHEMATICS THUS I WILL HAVE TO REVERSE ENGINEER IT
If I figure out enough of the circuit to figure out why it is not generating the very high voltage, I might be able to fix it. That assumes that it is a repairable part or that I can find a compatible 18KV supply from an oscilloscope or similar CRT device.
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