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Some earlier chassis (CTC-4,5,7 etc) specify that a load resistor of suitable resistance and wattage be used to properly "load" the power supply when working on the chassis without the horizontal section being connected to the yoke, CRT, and other components. Haven't worked on a 15. Maybe there is a similar method outlined in the service literature. Just pulling the HO tube might cause the B+ to rise to levels dangerous to other circuits.
Maybe someone else can offer a more thorough explanation. Good luck with the 15!
Kevin
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stromberg6
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