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In Reply to: I don't think this tube was intially designed for audio use posted by FenderLover on June 12, 2015 at 06:47:25:
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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- IIRC - unclestu 11:30:41 06/12/15 (7)