Quote:
Originally Posted by jr_tech
Mine are stiff dark-gray/black fiber about 0.020" thick 1.195" diameter with a 0.290" hole in the center. they are tinted dark brown to match the knob on one side.
jr
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I think they're phenolic. I have a few of them, as they came on a lot of RCAs from the early 50s through the late 50s; not just the CT-100. If you dig deep enough in any box of knobs, you'll find those. They filter to the bottom along with orphan knob springs, and moth-eaten felt washers.
Charles