Indicator tubes for transistor logic machines.

William Donzelli wdonzelli at
Sun Oct 28 13:41:10 CDT 2007

> Probably simple VFDs, like magic eye tubes on old radios.
> Leads are 2 filament/cathode, 1 grid and 1 plate (flourescent target)
> Probably very low filament voltage

Low everything. Except cost. Those little critters are getting quite
hard to find. And Etco once had them for a penny a piece!


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