W2I
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BrandMarconi
ClassVariable Mu H.F. Pentode
Base4 or 7 pin
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 | 150V | - | - | - | 3mA |
| Series Screen Resistor | 150V | - | - | - | 3mA |
| Reduced Voltage | 120V | - | - | - | 2.3mA |
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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