Quote:
Originally Posted by Electronic M
Seems less like a dummy load and more like a "the gun bias is/isn't in the right to make a picture" meter.
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Not so much a load.
Most of the internal parts involved resistor ratios to scale the voltage, etc.
The CRT filament supply went to the filament of the eyetube to check that voltage.
The G2 (first anode) voltage is the plate supply for the eyetube. No green glow means the first anode voltage is not in the right range.
The G1 bias is connected to the eyetube grid. Changing the TV's brightness control would vary the shadow on the eyetube.
It doesn't check electrostatic TVs, color TVs, the HV or focus supplies.
Very simple idea, very limited. Almost like a test CRT but without deflection or image display.