6AU5 gt beam tetrode tubes rca ~ tested good

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Subject: 6AU5 gt beam tetrode tubes rca ~ tested good
6AU5 GT Beam Tetrode Tubes RCA
These 6AU5GT beam tetrode tubes have been stored away for years. Made by RCA in the U.S.A., date coded 1960s with red logo. White boxed. Tubes tested well on my Hickok tester: 5400 to 6750 in mutual conductance with 5200 as average new.


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