W31
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BrandOsram
ClassVariable Mu Screen Pentode
Base7-pin
Filament13V @ 0.3mA
Construction
Primary TypePentode
EnvelopeMetallised bulb
SectionsSingle
Filament / Heater
Heater NotesIndirectly Heated Cathode
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage100 V
Audio Performance
Key Features
- Variable Mu
- Low anode-grid interelectrode capacity
- Universal range
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Recommended Operating Condition | 200V | 2700 | - | - | 8mA |
| Minimum Gain Condition | 200V | 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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