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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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4308-B vacuum tube outline illustration

Tube-number record

4308-B

0 archive entries

4308-B is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Standard, construction Triode, socket 4-pin, maximum plate voltage 2250 V, and maximum plate dissipation 250 W. The archive does not yet hold a photographed example of this type.

BrandStandard
ClassTriode
Base4-pin

Construction

Primary TypeTriode
EnvelopeGlass
SectionsSingle

Filament / Heater

MaterialThoriated tungsten

Absolute Maximum Ratings

Plate Voltage2250 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A AF Amp or Modulator (1)1500 V750010708135 mA
Class A AF Amp or Modulator (2)1000 V750010708210 mA
Class B AF Amp (Balanced 2-valve, Max Signal)1750 V———

Application Notes

Maximum frequency for standard ratings is 1.5 Mc. Above this, the anode voltage must be reduced (e.g., 750V at 4.5 Mc).

Filters

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Manufacturers

Brands

    0 results
    Plate Dissipation250 W
    Cathode Current325 mA

    Audio Performance

    Power Output575 W
    Key Features
    • Thoriated tungsten filament
    • Constant voltage type
    • High power output
    • Extra large bayonet base
    300 mA
    Radio Frequency Class B Telephony1750 V———215 mA
    Radio Frequency Class C Telegraphy1750 V———300 mA