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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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9C21 vacuum tube outline illustration

Tube-number record

9C21

0 archive entries

9C21 is a tube type in the TubeDatabase archive (class: Power Triode). Recorded specifications: brand RCA, year 1947, construction Triode, base Metal, socket Special / none, maximum plate voltage 17000 V, and maximum plate dissipation 40000 W. The archive does not yet hold a photographed example of this type.

BrandRCA
ClassPower Triode
BaseSpecial / none

Construction

Primary TypeTriode
EnvelopeGlass/Metal
Base MaterialMetal
Sections1

Filament / Heater

MaterialMultistrand Tungsten

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
RF Power Amplifier & Oscillator - Class C Telegraphy17000 V——407900 mA
AF Power Amplifier & Modulator - Class B (Per Tube)14000 V——403700 mA

Application Notes

The water flow must start before the application of any voltages and continue for at least 2 minutes after removal.

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Manufacturers

Brands

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    Plate Voltage17000 V
    Plate Dissipation40000 W
    Grid 1 Voltage-2000 V
    Cathode Current9000 mA

    Audio Performance

    Power Output30500 W
    Key Features
    • Water-cooled plate
    • Forced-air cooled seals
    • Multistrand tungsten filament