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Thanks for the input so far everyone. The hissing in the HV cage is coming from the area around the rectifier tube. I'll ignore that for now. Maybe it's even normal. The HV is only 4KV on the yellow wire.
Here's my plan:
Since I have low focus voltage, and it doesn't drop as the set goes out of focus, I'll hold off on condemning the crt or socket. I'll lift the yellow wire and see if the voltage goes up to 6KV. If not, I'll change the stick and/or green resistor. If it does go up, I'll lift the black wire and see what I get at the center pin of the focus control. If the voltage is between 4-6KV depending on the position of the control, I'll pursue the socket or CRT. If it stays low, I'll change the 6HS5 regulator tube. I hope I got that right, and someone correct me if I'm missing something.
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