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...C3 is marked as 0.02mFd 360V, but in the unit it is bypassed by a resistor and a 3100pF(? - value half illegible) 'Suflex' (picture attached). What is the reason for this not being on the circuit diagram? Is it a pre-calculated snubber circuit for the speed control switch?
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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.
I think the Suflex caps are polyester and as I recall, unlike electrolytics were long lasting and reliable. I wouldn't be changing them without a good reason.