IBM vacuum tubes

William Donzelli wdonzelli at
Mon Jun 22 06:56:34 CDT 2020

> Thanks!  What is the secret decoder ring that tells you 188 means GE?

EIA manufacturer codes. These were often applied to private and house
branded labelled tubes. Other numbers are 274 for RCA, 280 for
Raytheon, 158 for DuMont, and so forth.

EIA codes were used for non-tube electronic parrots.


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