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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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38 vacuum tube outline illustration

Tube-number record

38

0 archive entries

38 is a tube type in the TubeDatabase archive (class: Pentode). Recorded specifications: brand RCA, construction Pentode, base Metal, socket 5-pin, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.

BrandRCA
ClassPentode
Base5-pin
Filament6.3 V @ 300 mA

Construction

Primary TypePentode
EnvelopeST-12
Base MaterialMetal
SectionsSingle

Filament / Heater

Heater NotesHeater-cathode type, suitable for automobile and series-heater receivers.

Absolute Maximum Ratings

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A Power Amplifier250 V120010000012022 mA
Class A Power Amplifier180 V105011500012014 mA
Class A Power Amplifier135 V9251300001209 mA

Application Notes

Recommended for single or push-pull power amplifier stages. Transformer or impedance coupling is preferred. If resistance coupling is used, the D-C resistance in the grid circuit should be limited to 1.0 megohm.

Datasheets

Datasheet: 38.pdf

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

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    Plate Voltage250 V
    Grid 2 Voltage250 V

    Audio Performance

    Typical THD8%
    Power Output2.5 W
    Key Features
    • Heater-cathode type
    • Relatively low heater current
    • Suitable for automobile receivers
    • Suitable for power-line-operated sets (series-heater)
    Class A Power Amplifier100 V8751400001207 mA