Rca CTC-25 overview and help

[Electronic M]

The switch positions should be fairly obvious.. the potentiometer positions that you seem to be asking about vary with CRT health, signal conditions, and opperational health of the chassis.

Assuming you have the right HV voltage, focus voltage and the right boost voltage (if not focus on getting those right before expecting light on screen) then crank the brightness clockwise with contrast Midway and color fully counterclockwise and look for light...If none flip to service position on service switch. If still nothing then while watching the screen (in a mirror if needed) turn up one screen/G2 control till it gives light or you hit its mechanical limit...if you hit the limit reset to about where you started and try it on a different color screen. If still nothing after all screens tried look for a subbrightness control and crank that. If still nothing check cathode and geid voltages against the schematic.

Assuming you get light and have messed with G2 here's how to set G2 on a working set...turn brightness to min flip service switch feed set blank signal, turn red g2 for faint red line, then turn green g2 to make line yellow, then adjust blue to get white...if a color.is too weak turn up subbrightness or if none exists brightness and start again... that should make blacks black...if whites are funny colored adjust color drive controls.