I've just agreed to buy some NOS RCA valves, 2x 6SN7GTB and 3x 12AX7A. The 6SN7s are black plates (not sure if that's what the B stands for). The 12AX7s are short grey plates with the older 50s style thinner writing RCA logo, not the 70s style shorter/fatter style letters. I've read they should be pretty good, but has anyone tried any? I'm not aware of any fakes like Telefunken/Siemens/Tesla, anything I should look for?
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