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Bob, thanks for the hint. I'll send an email and see what happens.
I won't be able to work on the set for the next 5 or 6 weeks, as I will be traveling for business (and some for pleasure). Fortunately, one of the pleasurable parts will be the Early TV convention in Hilliard, and I'm thinking I might be able to find some help there. If not, the one thing that will definitely work is to put in two pots in place of each existing one, with a movable connection to select either the top wiper or the bottom wiper.
I showed the problem to someone at work, and they said "I wonder how the engineers at RCA designed the circuit in the first place, assuming they didn't have the unusual tapped pots when they started?" Something to think about, but other than clip leads and decade boxes, we haven't thought of any way to breadboard it.
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