Tube Testers

Classic emission tube testers

The “classic” cathode emission tube tester comes in many makes and models. Since they share the same circuit design, I have consolidated previous discussions into one article. Among the popular USA models are: Eico 625, Eico 628, Knight 600-series (83YX142, 83YX143, 600, 600A, 600B, 600C), Triplett 3413, Heathkit TC-1, TC-2, TC-3, IT-17, IT-21. Other makes/models …

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