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I wasn't aware that Allen Dumont invented the tuning eye tube. I'm more familiar with the inner workings of the sets than with the historical background of individual components, though. Sylvania's Technical Data series features a particularly detailed data sheet on the 6AL7 and one of RCA's tube manuals features a pair of application drawings showing the circuits of and visual displays from the 6AL7 as used with AM and FM detector circuitry.
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