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Thanks to all for the suggestions. I have been looking around on the web and found a site (Tubesound.com) that had some interesting info for me. According to them, the Triplett 3413, Heathkit TC1/TC2, Eico 625, and Knight 600 series (600, 600A, 600B,600C) are essentially the same tester. They speak highly of these instruments, so I have some food for thought.
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