First registered in October 1945 for +/- 90 V max peak cathode to heater insulation. Re-registered in June 1951 with the same cathode-heater insulation. Registration updated in December 1959, with cathode-to-heater insulation uprated to +/- 200 V.
Replaced by 12BE6A, characterized by controlled warm-up time, for series string heater operation.
* RMA/JEDEC register record available by courtesy of TCA* - Full record is downloadable here.
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