IIRC, Sam's bought the sets they used for the Photofacts, either that or they were lent them, in any case. I'm going to assume the my set was built with the more common 6AS6, just as the Sam's set apparently had. My set does have 3A3s where the Sam's shows 1B3s... who the hell knows?
I'll try both the 6BZ7 and the 6BQ7A; they are slightly different according to the GE manual, but close enough to assume that either will work.
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