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If you can find a basic emission type tube tester, such as an Allied (Knight) or Heathkit, it should serve your purpose. You might try the older TV shops in your area. They might just have something you could buy real cheap. Also, I've seen tube testers at ham fest and antique radio swap meets. There's always epay, but, the prices on there have gotten way out of hand. There's no way I'd pay in excess of $100 for a basic tube tester. The first one I had was a Knight 600A and I think I gave $20 for it in perfect condition.
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