IBM vacuum tubes

William Donzelli wdonzelli at
Tue Jun 16 10:04:49 CDT 2020

> Good question.  They have an IBM logo and "Made in USA", along with the
> part number (5965 or 5963) and a bunch of numbers that might give a hint
> as to manufacturer.  Any suggestions on how to decode them?

What are the numbers?

Details, man!


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