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Classic Currents

Tested Matched Pair National Union Type 20 Tubes (UX120 Equiv.) Engraved Bases

Tested Matched Pair National Union Type 20 Tubes (UX120 Equiv.) Engraved Bases

Tested and Guaranteed

$184.95 USD
$184.95 USD
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Tested Very Strong Matched Pair of National Union Type 20 Engraved Base Tubes.
These are the equivalents of UX-120 tubes.

Tubes are closely matched for mutual conductance (Gm), and internal structure - of which they are identical.
These tubes test well above NOS ratings.

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

Gm Test = 650 and 625 micromhos
Minimum pass/good = 330
Average NOS rating = 495

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