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30P1M / 30P1S tetrode tube
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SOLD OUT30P1M / 30P1S tetrode tube
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Rare output beam tetrode 30P1M (later name 30P1S) with a the heated oxide cathode is intended for an energy amplification in devices of broad application. Made in USSR, MELZ factory (from 1949 till 1950 only). NOS and never used before!

  • Filament voltage: 30V;
  • Anode voltage: 110V;
  • Voltage of the second grid: 110V;
  • Bias voltage on the first grid: -7.5V;
  • Filament current: 300 ± 25mA;
  • Anode current: 70 ± 22mА;
  • Second mesh current: < 12mA;
  • Steepness: 10±2.5 mA/V
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