Quote:
Originally Posted by TIMTAPE
From memory these are for calibrating the repro (playback) response for which components had to be individually selected in production, possibly because the tolerances on the record/play head couldn't be made tight enough to use standardised resistors and capacitors.
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I think I see now - by dint of being across the switch and the 4-pin socket, C3 is actually coming into play for the 3 3/4"/sec equalisation.