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Classic Currents

Tested Matched Pair RCA 7AU7 Tubes Date Codes AK AQ Twin Triode Vacuum Tubes

Tested Matched Pair RCA 7AU7 Tubes Date Codes AK AQ Twin Triode Vacuum Tubes

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Tested Matched Pair of RCA 7AU7 Tubes with Original Boxes.
Date Codes AK and AQ.

Tubes are closely matched for mutual conductance (Gm) and internal structure - of which they are identical.
This matched pair tests well above above NOS.
The front tab/flap of each box has a small bit of faint writing on it.

Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:

Gm Test = 2500-2275 and 2650-2375 micromhos
Minimum pass/good = 1400-1400
Average NOS ratings = 2100-2100

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