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I'm not sure how many Hickok models it works on, but the company made an adapter to allow testing of the (then) newer compactron types and others that came out in the 60s. I know my 6000A came with either that capability or the backward compatible version which would test the old 20s-30s "big pin" tubes which I simply keep around an old 40s Sylvania tester (emissions) for.
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"Face piles of trials with smiles, for it riles them to believe that you perceive the web they weave, and keep on thinking free"
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