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(1) Tested Raytheon 6SN7GTB Tube Code E20 Black Plates Round Halo Getter 6SN7GT

(1) Tested Raytheon 6SN7GTB Tube Code E20 Black Plates Round Halo Getter 6SN7GT

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(1) Tested Very Strong Raytheon 6SN7GTB Tube.
Date Code E20.

Black plates with sawtooth micas and a round halo getter .

This tube tests as NOS.

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

Test Result = 2500-2625 micromhos
Minimum pass/good = 1650-1650
NOS Target Value = 2475-2475

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

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