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

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N31 vacuum tube outline illustration

Tube-number record

N31

0 archive entries

N31 is a tube type in the TubeDatabase archive (class: Output Pentode). Recorded specifications: brand Osram, construction Pentode, socket 7-pin (non-miniature), maximum plate voltage 200 V, and maximum plate dissipation 8 W. The archive does not yet hold a photographed example of this type.

BrandOsram
ClassOutput Pentode
Base7-pin (non-miniature)
Filament26 V @ 0.3 mA

Construction

Primary TypePentode
EnvelopeCarbonised bulb
SectionsSingle

Filament / Heater

Heater NotesIndirectly Heated Cathode

Absolute Maximum Ratings

Plate Voltage200 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Recommended Operating Conditions200 V10000——40 mA

Application Notes

Specifically designed for the output stage of radio receivers or low frequency amplifiers in series-heater DC or DC-AC Universal Receivers. High sensitivity allows direct feed from diode detector.

Filters

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Manufacturers

Brands

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    Plate Dissipation8 W
    Grid 2 Voltage180 V

    Audio Performance

    Key Features
    • High mutual conductance
    • High sensitivity
    • Suitable for series heater strings (0.3 amp)
    • Carbonised bulb