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more intresting tidbits, looking over the schematic, I can see the brightness control gets it neg voltage for low brightness from the horz out grid (filtered thru a .22 cap and 470j resistor. I am pretty sure I increased this neg voltage from the -40 to something less (more neg) when I was changing the plate load resistor in the horz osc in a attempt to increase drive to the horz out. Later CTC get this neg voltage from the grid of the blanker tube. I think I will check the later CTC-7 and see if it makes any changes for the great neg voltage at the horz out tube shown on that schematic (and if there is any changes in the circuit that taps this to supply the brightness control with its neg voltage).
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