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W2I
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BrandMarconi
ClassVariable Mu H.F. Pentode
Base7-pin (non-miniature)
Construction
Primary TypePentode
Envelope125x41 mm
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage150 V
Grid 2 Voltage150 V
Audio Performance
Key Features
- Variable Mu
- Metallised valve
- High gain
- Economical operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard | 150 V | — | — | — | 3 mA |
| Series Screen Resistor | 150 V | — | — | — | 3 mA |
| Reduced Voltage | 120 V | — | — | — | 2.3 mA |
Application Notes
Full control of gain is given by 9-12 volts bias. The total effective resistance between grid and filament should not exceed 2.0 megohms. May be used as a grid leak detector with an anode load of 75,000 ohms.
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