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AMAZING HEATHKIT FIND

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The Heathkit TC-2 Tube Checker

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Heathkit model TC-2 tube tester

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The Heathkit IT-17 Tube Checker

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Heathkit Mutual Conductance Tube Tester TT-1

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DG’s Practical Notes, E#3 Heathkit tube checker IT-21, 1960

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