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...
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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