Quote:
Originally Posted by old_tv_nut
Thanks for the later info!
Did the separate HV supply run at H rate, or entirely independently?
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The HV supply typically ran at the lower horiz rate and didn't change. Some used a dedicated osc/drive IC like a SMPS would, others would take use the horiz drive from the Jungle IC to drive the High Voltage output transistor.
The sweep rate of course would switch as the HD source was selected.
On many of these, lack of video muting would show a weird horiz line show on the CRT when switching between a standard def and high def source.
John
12-14-2020, 06:20 PM
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