Quote:
Originally Posted by ARC Tech-109
Being a compost input it doesn't need the AGC to control the overall gain of the first RF amp. The issue here is the Magnavox T940 was never designed with the external composite video input in mind and everything was taylored to work together this one reason for the external sync separator as it's not so finicky with the variations of the levels and line voltage which would normally be countered by the AGC.
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Thanks. I see this makes sense as the jeep circuit DC restored output is probably not following B+ variations the same as the set's video detector. However, I would be curious to put the whole thing on a variac and investigaate what the variations are, to find if it's possible to make the jeep circuit work by itself.