Quote:
Originally Posted by David Roper
Slope detection works perfectly well and no serious restorer would ever modify the AM sound section of a prewar set.
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Didn't think the fidelity would be that great... Anyway, today, with no more over the air NTSC analog, someone with a pre-war TV set could modify an RF modulator to remove its FM modulator, and replace it with an AM modulated 4.5MHz source. (I think it was 4.5MHz for the sound carrier back then, if not, well use the correct frequency). This way, no need to touch the AM demodulator inside the set: it sees a pre-war AM sound carrier signal.