15 Jun
2020
15 Jun
'20
7:03 a.m.
Hard to say, without the modules they came from.
As far as my (limited) understanding of vacuum tube logic goes, double triodes were very
common for implementing basic boolean logic functions. Therefore, most IBM vacuum tube
computers and data processing machines would have hundreds/thousands of similar
dual-triode tubes making up the logic.
Basically, they could be out of any vacuum tube machine made by IBM. IBM 600 and IBM 700
series machines being the most likely.
On Jun 15, 2020, at 2:51 PM, Guy N. via cctalk
<cctalk at classiccmp.org> 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.
These are dual triodes with the same pinout as common small-signal audio
tubes such as 12AX7/7025/ECC83, but characteristics closer to 12AT7 or
12AU7. My RCA Receiving Tube Manual says they're designed to withstand
being held in cutoff for long periods of time, and mentions digital
applications.
Anyone know what kind of IBM machine these would have been used in?