Tested Matched Pair of CunninghamCX-301-A (01A) Tubes.
Engraved bases, globe/balloon envelopes and brass pins.
One tube (the 650 micromho) has a very small 1/8" hairline located above the "C" logo and some deep scratches on the backside of the base. Both areas have been pictured for your consideration.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
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