Tube-number record
R. 31
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R. 31 is a tube type in the TubeDatabase archive (class: Power Triode / Output Tube). Recorded specifications: brand Radio-Watt, construction Triode, base Nickel-plated, socket Special / none, and maximum plate voltage 200 V. The archive does not yet hold a photographed example of this type.
BrandRadio-Watt
ClassPower Triode / Output Tube
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopePear-shaped glass
Base MaterialNickel-plated
SectionsSingle
Filament / Heater
MaterialV-shaped
Absolute Maximum Ratings
Plate Voltage200 V
Cathode Current100 mA
Audio Performance
Key Features
- Nickel plate
- Molybdenum grid
- V-shaped filament with constant tension suspension
- Low frequency amplification
- Small power transmitter
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 140 V | 785.7 | 7000 | 5.5 | — |
Application Notes
Specifically designed for loudspeaker reception and final stage amplification. Also suitable as a low-power transmitter lamp.
Datasheets
Datasheet: R31.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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