RCA CTC16 question

[DavGoodlin]

Another 6DW4B damper did not change anything. I changed the .1 decoupling cap also.

I lifted the HV cage and still the same. I hesitate to think the worst, a bad fly

Time to look for a 6JE6A in the barn, no set to rob a good one from. All four of my RCAs use a 6DQ5

[old_coot88]

Originally Posted by DavGoodlin

...Time to look for a 6JE6A in the barn, no set to rob a good one from.

What voltage do you get on G2 with the tube removed?

[DavGoodlin]

Originally Posted by old_coot88

What voltage do you get on G2 with the tube removed?

I got the full 405 vdc on G2 when HOT is pulled. It turns out the HO tube was dead, when my tester merely showed it to be slightly weak I need a good tester BUT I do have plenty of tubes.

I put a slightly-used GE 6LQ6 in and got no HV but the plate got full red as the cathode current climbed rapidly to 430 ma!! I quick measured the screen G2, and it was up to 175, normally 145.

Pulled plate cap and disconnected screen resistor again, measured the horizontal drive, -55 vdc and a 200 voly p-p sawtooth on the grid G1. No issue there.

I'm fixing to condemn the flyback*, seeing this dreadful symptom on old color RCA's before, and using a flyback ring-tester should confirm. The fly's DC resistance may also give a clue.
Ideas?

* Owner has a spare fly, no hunting needed