Quote:
Originally Posted by N2IXK
You may have difficulty directly measuring the 3A3 filament voltage, because it is a high frequency (15.7 kHz) and pulsed waveform.
Most AC voltmeters won't read correctly on non-sinusoidal signals. And of course, if the 3A3 plate cap is connected, the filament is floating at HV to ground.
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Thanks for the info, I'll keep that in mind for future reference.
Problem solved. There was a VERY loose transistor on the horizontal output board. One leg wasn't being gripped at all. I re-seated the board just for good measure, stuck a piece of wire beside the loose pin, powered on and presto, the HV was back. The picture is awful and barely holds sync in either direction, but hey, she's a runner. The piece of wire can barely be seen in the photo.
Edit: Later on it lost vertical sweep. The fellow I got it from did say it has a vertical problem.