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Philco 37-60: Need to Revise Tone Control Design
whirligig
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Posts: 38
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City: manhattan beach, CA
#12

08-02-2019, 11:44 AM
I will have to revisit the tone control after I resolve the alignment issue. It looks like the broadcast band antenna transformer has an open in the primary. What is stumping me right now is that I still gets the broadcast band pretty well except for some motorboating at 600khz and below. Also the police/sw band is not fully aligned. Trimmer #7 is maxed out and I can't align 6 mhz to the dial.

Once all that is resolved, I  will have to redo the whole tone control circuit. I realized why the 0.22uf sounded good. It's in parallel/series with the other tone caps that are still in the circuit. They need to be all removed and then a single tone cap to the 100k pot is added.
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RE: Philco 37-60: Need to Revise Tone Control Design - by whirligig - 08-02-2019, 11:44 AM



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