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just fooling around with it I found that if I put a 22meg resistor between the focus pin and ground, the focus comes in nicely (at about 3.5kv) I did not check the screen voltages on the CRT, I assume the focus is done by some electrostatic deflection between the focus screen and the G2, but not sure about that. This set uses a pot that goes between two leads off the fly, maybe on side of the pot is open (low side of fly take off lead). well at least I know the CRT can focus, just need to work on the voltage.
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