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6BN6 Beam Tubes RCA ~ Tested Good These 6BN6 7-pin miniature gated beam discriminator tubes have been stored away for years. Made by RCA in the U.S.A. White boxed. Tubes tested within the green "good" range on my Hickok tester: 600 to 650 / 550 to 600 in mutual conductance where 700/500 is average new. |