Quote:
Originally Posted by wa2ise
I'd use a 4.5MHz FM modulator and sum that with the video at the 6AS6 grid. It's like an intercarrier scheme, and a benefit is that if the channel frequency oscillator drifts, the sound carrier will follow it.
You could disconnect the 2nd video input jack and use that for the audio input.
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I like that idea. I'm going to try to use this circuit altered to run at 4.5Mhz. I'm going to build a small sub chassis to bolt in above deck under the top cover so as to make my work easily reversible.
I've already tested the osc. section without the biasing resistor network or 27pF cap (just an all out basic Hartley osc.).