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If you follow all the DC paths from pin 7 (grid) to ground, you see 5600 ohms in parallel with 8200 ohms and all that in parallel with the video detector diode and a few small coils. Because of the diode, I'd bet you get a different reading if you reverse your meter leads or even if you use a different ohmmeter, depending on the voltage of the meter's internal supply and its polarity.
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Old TV literature, New York World's Fair, and other miscellany
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