High Voltage problem

[andy]

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[VA561]

[QUOTE=andy;3179849]Does the HV adjustment have any effect? There are two general causes of low HV. Either the flyback isn't outputting enough voltage (a bad HV rectifier could also cause this), or it's being loaded down by the regulator.

The HV adjustment has little to no effect. A strange thing, I can't get the screen to go black. The picture I posted of a blank screen was with the brightness turned all the way down.

[andy]

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[VA561]

Just ordered n.o.s. 6BK4A-B and 3AT2 tubes. Is it ok to use a 6BK4A-B in place of the 6BK4?

[N2IXK]

Originally Posted by VA561

Just ordered n.o.s. 6BK4A-B and 3AT2 tubes. Is it ok to use a 6BK4A-B in place of the 6BK4?

Yes, but the 6BK4C is the preferred type, with the best X-ray shielding.

[VA561]

Tried pulling the crt cap off as suggested by Andy. Voltage at the crt anode with cap off, 25K.

[dieseljeep]

Originally Posted by VA561

Just ordered n.o.s. 6BK4A-B and 3AT2 tubes. Is it ok to use a 6BK4A-B in place of the 6BK4?

Did you remove the HV rect tube socket and check the resistor in there?
Is it jumpered out, like it was recommended in another thread.

[VA561]

Going to tackle it next sat. Excellent advice from everyone. Much appreciated. I want to keep this set for a long time so I want to get it fixed.

[zeno]

OK this was missed by all. If you turn the brite down on any
set the pix should go black or nearly so. Fix this first as it causes
an abnormal load on the HV. Start with a by the book set-up especially
the G-2's & bright limit. Could be just someone set them too
high to get a brighter pix. If not adjustments move to the
vid amp & blanking tubes. I remember NO scenario where the
HV will cause too much brite........
Normally I would start at the sweep then move on BUT the video
is so far off it could be the root of the problem.

73 Zeno
LFOD !

[QUOTE=VA561;3179850]

Originally Posted by andy

Does the HV adjustment have any effect? There are two general causes of low HV. Either the flyback isn't outputting enough voltage (a bad HV rectifier could also cause this), or it's being loaded down by the regulator.

The HV adjustment has little to no effect. A strange thing, I can't get the screen to go black. The picture I posted of a blank screen was with the brightness turned all the way down.