On Dec 30, 9:49*pm, Sylvia Else wrote:
hr(bob) wrote:
Just saw the picture shrink and the HV drop from 25KV down to 20KV.
Found what appears to be the regulator, which appears to have already
been replaced and will have to find the output terminal and watch what
it does when the trouble reappears. *Did find out that just clicking
the power button off and then back on, within 10 seconds or so, the
picture returned to normal and the HV went back up to 25 KV. *More
detective work to do. *Regulator has markings STR 30135 6NO1. *Five
terminals, only 3 have connections, other two terminals may be for
conducting heat out of the unit.

Seems odd. I thought it was agreed that a drop in HV would result in a
larger, but dimmer, picture.

Perhaps the HV is being dropped *because* the picture is shrinking.

Sylvia.

I agree, it is driving me up the wall, but I have so many other things
going on I can't just sit there and wait for something to happen. If
the lower HV coincides with a reduced drive to the deflection coils
and at the same time the picture is blanked out during horizontal and
vertical retrace as before, you would expect to see some change in
brightness, but the picture size would be dependent on whether the
reduced deflection current or the reduced high voltage dominated.
Will look some more this afternoon if I don't have to go out.