Tube-number record
W31
0 archive entries
W31 is a tube type in the TubeDatabase archive (class: Variable Mu Screen Pentode). Recorded specifications: brand Osram, construction Pentode, socket 7-pin (non-miniature), and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandOsram
ClassVariable Mu Screen Pentode
Base7-pin (non-miniature)
Filament13 V @ 0.3 mA
Construction
Primary TypePentode
EnvelopeMetallised bulb
SectionsSingle
Filament / Heater
Heater NotesIndirectly Heated Cathode
Absolute Maximum Ratings
Plate Voltage250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Recommended Operating Condition | 200 V | 2700 | — | — | 8 mA |
| Minimum Gain Condition | 200 V | 10 | — | — | — |
Application Notes
Suitable for use in High Frequency or Intermediate Frequency Amplifying portions of a receiver. A potentiometer network is recommended to maintain screen voltage sensibly constant.
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