Re: Murphy V410 TV
Just about all the waxie and Hunts capacitors needed replacement.
The attached picture shows the results achieved so far. There's that frame linearity fault to sort out and also a curious disturbance on the picture which takes the form of random horizontal lines. The latter is the result of line timebase pulses entering the IF amplifier and causing bursts of oscillation. The effect is most apparent when the contrast control is turned down to minimum.
The V410 has a "gated" vision AGC system. I'm certain that this not a back porch sampling system and is more likely to be a sync cancelling circuit.
DFWB.
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