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The 7.5 vdc on pin 3 of V6 (far side C59) is perfectly understandable, as there is no video for the circuit to compare to and thus no pulses on pin 6, the gain is being turned up to the max, if you were to hook up the subber to the grid of V2 like you did before, as Squirrel boy mentioned, using a decent video source, and adjusting R14, you should see that 7.5 vdc come down as the AGC tries to bring down the gain.
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