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

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RS 391 vacuum tube outline illustration

Tube-number record

RS 391

0 archive entries

RS 391 is a tube type in the TubeDatabase archive (class: Transmitting Pentode). Recorded specifications: brand Telefunken, construction Pentode, socket Special / none, maximum plate voltage 1500 V, and maximum plate dissipation 110 W. The archive does not yet hold a photographed example of this type.

BrandTelefunken
ClassTransmitting Pentode
BaseSpecial / none
Filament12.6 V @ 1.3 mA

Construction

Primary TypePentode
EnvelopeGlass
SectionsSingle

Filament / Heater

Heater NotesIndirectly heated oxide cathode

Absolute Maximum Ratings

Plate Voltage1500 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
RF Amplifier1000 V4500—90100 mA
Suppressor Grid Modulation (Carrier)1500 V———15 mA

Application Notes

A series resistor (min 3000 Ohms) is required in the screen grid circuit to prevent overloading.

Datasheets

Datasheet: RS391.pdf

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

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    Plate Dissipation110 W
    Grid 2 Voltage450 V
    Grid 1 Voltage-450 V
    Cathode Current175 mA
    H-C Voltage100 V

    Audio Performance

    Power Output100 W
    Key Features
    • 100 Watt-Sendepentode
    • Oxyd-Kathode
    • Grid Voltage Modulation
    • Suppressor Grid Modulation
    • Plate Voltage Modulation