Thread: Filament Voltage
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Old 02-10-2025, 06:00 PM
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bandersen bandersen is offline
RCA 741PCS
  
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Location: Chicago, IL
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110 had been around a couple years already but with longer necks and conventional guns. Philco repurposed a heater/cathode/grid from a miniature 7/9 pin receiving tube to make the neck much shorter.

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