Admiral 19A12 High Voltage Issue

[Electronic M]

Originally Posted by zeno

You seem to have a good grasp of things. Well done !
Doubling the hoz osc freq will cause the hoz out tube to conduct
twice as much & maybe pull down the B+. +- 5% ok but
-10% should give other symptoms like bad width.
Order I go in is power supply then H osc/ HV. At that point you get
a good idea of the condition of the CRT, yoke & FBT.
So for now get the osc on freq.
BTW one of the most common problems after recap is hoz freq off.
The set drifts over the yrs & changing cap puts the "right" values
back in. Also for HV 1KV per inch is a good general rule.

enuf fer now
73 Zeno
LFOD !

Zeno, you're missing the fact that this is a electrostatic deflection TV. There's no flyback transformer, HV is derived from a RF oscillator separate from the deflection systems, and the horizontal can be operated off frequency without drastic changes to B+ current.... Heck I know of someone who built a composite monitor out of a junk set and was able to make it display 720P HD by adjusting H osc frequency.