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The horiz output tube makes the grid go negative. Very limited operation with the cap off the horizontal output can show some negative if the horizontal oscillator is running. It is best to scope the grid of the horizontal if you can. Check the horizontal phasing (AFC) diodes for leakage. Once in a blue moon I have had them catch me.
On that set, also check your horizontal hold control for opens or leakage. Also, check continuity of the horizontal oscillator coil. A snapped wire will stop the oscillator
Plate resistors of the horizontal driver tube also.
Last edited by Zenith26kc20; 02-26-2015 at 08:19 AM.
Reason: wrong instruction, too early, no coffee
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