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39/44 Vacuum Tube New and Used

$3.00
39/44 Vacuum Tube New and Used
39/44 Vacuum Tube New and Used

Home / Shop

39/44 Vacuum Tube New and Used

$3.00
Model Number: 3944NEW
Type 39/44 5-pin variable-mu screen-grid tetrode tube with top cap for vintage auto and DC radio receiver circuits. Available in new and used condition.
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Categories: Vacuum Tubes and Accessories
Manufacturer: Multiple Manufacturers
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  • Description
  • Specifications

The Type 39/44 (originally designated UY-239 and UY-244) is a 5-pin grid-cap indirectly heated variable-mu screen-grid tetrode designed for RF and IF amplifier stages in 6.3-volt automobile and DC receivers. Introduced in 1931 and later consolidated under the dual designation 39/44, it features remote cut-off characteristics that allow effective volume control and reduce cross-modulation in automotive and battery radio circuits.

  • Tube Function: Variable-Mu Screen-Grid Tetrode (RF / IF Amplifier)

  • Base Design: 5-Pin Standard Base (UY5 / S5A) with Top Grid Cap

  • Glass Shape: ST-12 or Globe (S-12)

  • Heater Voltage: 6.3 Volts AC / DC

  • Heater Current: 0.3 Amps (300 mA)

  • Maximum Plate Voltage: 250 Volts DC

  • Screen Grid Voltage (Grid 2): 90 Volts DC

  • Transconductance: 1,000 micromhos (at -3V Grid 1 Bias)

  • Plate Resistance: 1,000,000 Ohms (1 Megohm)

  • Cathode Heating Method: Indirect (Unipotential)