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

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1A4 vacuum tube outline illustration

Tube-number record

1A4

0 archive entries

1A4 is a tube type in the TubeDatabase archive (class: Super-Control R-F Amplifier Pentode). Recorded specifications: brand RCA, construction Pentode, socket 4-pin, and maximum plate voltage 180 V. The archive does not yet hold a photographed example of this type.

BrandRCA
ClassSuper-Control R-F Amplifier Pentode
Base4-pin

Construction

Primary TypePentode
EnvelopeST-12
SectionsSingle

Filament / Heater

MaterialFilament Type

Absolute Maximum Ratings

Plate Voltage180 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
RF Amplifier90 V7206000004252.2 mA
RF Amplifier180 V75010000007502.3 mA

Application Notes

Useful as a radio-frequency amplifier or intermediate-frequency amplifier in battery-operated receivers. Requires less B-battery power than type 34.

Datasheets

Datasheet: 1A4.pdf

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

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    Grid 2 Voltage
    67.5 V
    Grid 1 Voltage-3 V

    Audio Performance

    Key Features
    • Super-control pentode
    • Battery-operated
    • Low B-battery power consumption
    • Remote cut-off