For modern guitar amps, you need 6L6GCs, or for some with slightly lower voltages, 6L6GB (or WGB or any other combination with a B). Plain 6L6s - especially anything with a metal casing, like they were made in the 1940s - won't hold up to guitar-amp voltages and you'll probably blow the tube and may damage the amp.Fear said:Some dude says he has a stash of vintage 6L6 RCA and Amperex tubes. I was gonna go check on them, but didn't know what to look for. Any particular models to look for.
More or less meaningless for this application. A tube tester will show up a definitely faulty tube, and is useful for measuring them if you're trying to make a matched set, but it won't tell you if the tube will work in a guitar amp - they don't operate them at anything like the same voltages and currents (so you can easily get a tube which 'tests good' that fails in an amp), or test for microphonics, noise or other problems. You really need a way of testing them in an amp circuit under controlled conditions - i.e. don't just stick them in your amp to see what happens.He says he's got tube testing equipment to check them with.
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