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Classic Currents

Tested Matched Pair 1963/64 Western Union 6SN7GTB Tubes Codes 64-39 63-39 6SN7GT

Tested Matched Pair 1963/64 Western Union 6SN7GTB Tubes Codes 64-39 63-39 6SN7GT

Made by GE for Western Union

$68.95 USD
$68.95 USD
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Tested Matched Pair of Western Union 6SN7GTB Tubes.
Date Codes 63-39 and 64-39 (September of 1963 and 1964).
The 188 EIA codes indicate that these tubes were made by GE for Western Union.

Tubes are closely matched for Gm testing and internal structure - of which they are identical.
Gray 4 hole ladder plates with side round O getters.

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

Gm Test = 2750-2750 and 2875-2875 micromhos
Minimum pass/good = 1650-1650

Also performance tested in-circuit through a Class A amplifier with no microphonics detected..

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