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05-05-2017, 08:49 AM

bandersen

RCA 741PCS

Join Date: Mar 2009

Location: Chicago, IL

Posts: 8,821

Yes, it uses a stacked supply. You should have about 140 volts on the cathode (pin 1) of the 6AS5.
The contrast control which varies the gain of the video amp is tied to that point.

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