(1) Tested Strong Sonatron X201A (01A) Globe/Balloon Tube.

Brass pins with a bare bullseye base bottom which indicates that this is an early version of Sonatron's 01A instead of the typical licensing statement seen on later tubes.

Tight and secure base with no looseness.

The original label is still intact with little to no wear.

This tube tests above NOS specs.

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

Test Result = 800 micromhos

Minimum pass/good = 460

NOS Target Value = 690

~ Please view all 5 photos ~

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