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tube

  1. beammeup

    [WTD] Valve Tester Please !

    I have accumulated boxes of valves over the years (some from auctions etc) for no good reason. I would like to slowly sell them all off - but before doing so would like to test them so the buyer is assured (and I am assured) that the valves are in good shape. If anyone has a working and...
  2. loz_the_guru

    Some help understanding tube testing measurements?

    Is anyone familiar with tube testing values? I'm looking at a few sites which list IA and GM values. These are usually presented twice, e.g. one tube has: IA: 67 GM: 4.3 IA: 65 GM: 4.0 Another has: IA: 82 GM: 4.7 IA: 94 GM: 5.8 Both of these are advertised as NOS. I've had a quick google but...


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