Tested Balanced and Matched Pair of RCA Radiotron UX120 (Type 20) Tubes.

Engraved bases and brass pins with balanced Gm testing.

Tubes are matched for mutual conductance (Gm) and internal structure - they are identical.

Both tubes test very close to NOS.

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

Test Result = 450 and 450 micromhos

Minimum pass/good = 330

NOS Target Value = 495

~ Please view all 5 photos ~

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