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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

56R9

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56R9 is a tube type in the TubeDatabase archive (class: Triode-Pentode). Recorded specifications: brand General Electric, year 1962, construction Compactron, socket Compactron, maximum plate voltage 150 V, and maximum plate dissipation 6.5 W. The archive does not yet hold a photographed example of this type.

BrandGeneral Electric
ClassTriode-Pentode
BaseCompactron
Filament14 V @ 0.15 mA

Construction

Primary TypeCompactron
EnvelopeT-9
SectionsHigh-mu Triode and Beam-power Pentode

Filament / Heater

Heater NotesSeparate heaters for the two sections; Triode 14V, Pentode 42V.

Absolute Maximum Ratings

Plate Voltage150 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Pentode Section (Class A Power Amplifier)120 V750010000—49 mA
Triode Section (Class A Voltage Amplifier)100 V1800555001000.6 mA

Application Notes

The triode is intended for audio-frequency voltage-amplifier service and the pentode for power-amplifier service.

Filters

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Manufacturers

Brands

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    Plate Dissipation6.5 W
    Grid 2 Voltage135 V
    Cathode Current65 mA
    H-C Voltage200 V

    Audio Performance

    Typical THD10%
    Power Output2.3 W
    Key Features
    • Compactron
    • Separate heaters
    • High-mu triode
    • Beam-power pentode