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Check the D77 detector, C22 4uf and the effect of disconnecting any connections to pin 1 of the D77 vision int. limiter section.
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I have tried another D77 with no improvement. I have disconnected the limiter circuit from pin 1 of the D77. there is a slight improvement but the problem is still there.
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Those earlier bridged chokes will have some effect ?
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I have checked the two on the HMV, one is O/C and the other looks ok, I suppose I could try the good one to see if it helps.
Mark