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Forgot to update this thread!
I was finally able to mod the CTC-9 to include a drive control, which basically involves installing a pot, cap and resistor. I just copied the schematic of the CTC-7 chassis, and it worked a treat. Cathode current is now spot on where it should be, and the picture quality did not suffer. Width is still good, too. last thing I'm gonna do is see about getting a few louvers punched into the HV cage, then I'll install a fan and call it done. That should make a very stable platform for long-term watching.
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Evolution...
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