Thanks for the replies, everyone.
I honestly don't know exactly what it's *supposed* to do, maybe the "master" control isn't an overall volume like I think it is. It does have *some* effect, though it is significantly less than I would have expected.
I just can't find anything really wrong, so...
Even when I have it out of an enclosure and there is a very clear air gap there is no change.
That was the first thing I thought too— maybe something was poking thru the tape
I’m going to take these pots off— maybe I missed something underneath one
I put a Pastel Preamp together, and it seems to generally work. The Pre control works and I think sounds like it should, but the Master volume control has virtually no effect whatsoever and Tilt has *some* effect but it is extremely subtle.
This makes me think there is something wrong, and I...