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Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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Tube-number record

339A

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339A is a tube type in the TubeDatabase archive (class: Power Pentode). Recorded specifications: construction Pentode, socket Octal, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.

ClassPower Pentode
BaseOctal
Filament6.3 V @ 1000 mA

Construction

Primary TypePentode
Sectionssingle

Filament / Heater

Heater NotesIndirectly heated cathode

Absolute Maximum Ratings

Plate Voltage250 V
Grid 2 Voltage250 V

Audio Performance

Power Output3.5 W
Key Features
  • Suppressor-grid pentode
  • Indirectly heated cathode
  • Power outputs of approximately 3.5 watts

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical Operation 1250 V———30 mA
Typical Operation 2250 V———30 mA
Typical Operation 3250 V———26 mA

Application Notes

Intended for use primarily as an audio-frequency power amplifier where plate voltage is not in excess of 250 volts.

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