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Be aware that some TV sets had the audio output tube's cathode act like a power supply for the IF strip. That the audio output tube's B+ was around 300VDC, and the cathode biased up to around 130VDC. Which in turn fed the IF strip. That way, they didn't waste power thru resistors to get from 300VDC (mainly for the deflection circuits) to something about half that to power the audio and the IF. The audio output and the IF strip stages were effectively in series.
Also, if you have a source of S-video, you can get a much better color picture if you can inject the luma and the chroma signals to their respective points after the chroma-luma separator filters inside the color TV set. But this isn't that easy to do. Advanced experts only on that one.
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Last edited by wa2ise; 03-31-2011 at 09:57 PM.
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