Help wanted resurrecting 1969 Zenith 12A10C15

[Bill R]

Have you tested the CRT? The blue looks like possible low emission. Focus is deffinately off. You will need to get a HV probe to measure high voltage at the CRT. It looks low. That could cause the focus problem as well.

[Electronic M]

Originally Posted by Bill R

Have you tested the CRT? The blue looks like possible low emission. Focus is deffinately off. You will need to get a HV probe to measure high voltage at the CRT. It looks low. That could cause the focus problem as well.

Yes, If the HV is low it can ruin the focus. If the CRT has good enough emission HV can be VERY low and reasonable normal brightness can still be achieved at the cost of terrible focus.

[zeno]

There is a brightness range on rear near the power
transformer. When you are done you should be able to
turn the brite, contrast & color level all the way DOWN
and not & not get a pix. Also should have no thin white lines.
Recommend you also test the HV.

73 Zeno
LFOD !