IBM vacuum tubes

Camiel Vanderhoeven camiel at
Tue Jun 16 10:13:45 CDT 2020

Mosyt likely GE.

"IBM did the final assembly, but more than 400 companies supplied parts and subassemblies for its computers, including GE for vacuum tubes and 3M for magnetic tapes.” (

> On Jun 16, 2020, at 4:58 PM, Guy N. via cctalk <cctalk at> wrote:
> On Mon, 2020-06-15 at 10:24 -0400, William Donzelli wrote:
>>> While going through my assortment of old vacuum tubes looking for audio
>>> treasures, I found a handful of IBM branded ones.  Mostly 5965, but
>>> there's one 5963 mixed in.
>> Who made them?
> 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?
> These came to me from my father, who worked in the Vacuum Tubes
> department at GE for a while when I was growing up, so there's a good
> chance the OEM was GE.

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