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Most of the DC restore circuits are more complicated than this, and a lot of them use the same triode for synch separation and DC restore. It makes some sense, since the triode grid gives diode action when driven positive.
Im interested if the above circuit functions decently or not. Im sure the original set designers (and others here!) are aware of more practical limitations and tradeoffs than I am.
screen shots and/or scope captures would make for further discussion! that little simulation doesnt model the video pentode output impedance or anything...so...mileage may vary!
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