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Classic Currents

Matched Pair Philco 6SN7GTB Tubes Black Angle Plates 57-04 57-08 6SN7GT

Matched Pair Philco 6SN7GTB Tubes Black Angle Plates 57-04 57-08 6SN7GT

Tested and Guaranteed

$74.95 USD
$74.95 USD
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Tested Matched Pair of Philco 6SN7GTB Tubes.
Date Codes 57-04 and 57-08.
The 312 EIA codes indicates that these tubes were made by Sylvania for Philco.

Tubes are closely matched within 7% for Gm testing (see below) and internal structure - they are identical.
Black angled T plates and clear mica spacers.

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

Gm Test = 2625-2500 and 2500-2450 micromhos
Minimum pass/good = 1650-1650

Further tested under real operating conditions on a Class A amplifier and exhibiting no microphonics.

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