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Questions about tubes and gear that glows. FAQ

IIRC

The red base series were designed for the early main frame computers. They (computers) were left on 24/7 and tended to have issues with cathode poisoning and the Red Base series were designed to avoid that. In addition the Red Base series were designed to have extra long life and probably were among the first of the 10K hour tubes.

Rumors have it that the Red Base tube construction were actually subcontracted out to GE and GE also made very similar looking tubes with brown bases (triple mica, extra support rods etc)


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