IBM vacuum tubes

Mark Linimon linimon at
Wed Jun 17 12:15:16 CDT 2020

On Wed, Jun 17, 2020 at 05:14:11PM +0000, Mark Linimon via cctech wrote:
> These were a higher-spec version of ... some really common tube which I
> no longer remember.

And which was mentioned in the original post -- oops!


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