W17
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BrandMarconi
ClassVariable-Mu R.F. Pentode
BaseB7G
Construction
Primary Typepentode
EnvelopeTubular
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage90 V
Grid 2 Voltage67.5 V
Cathode Current5.5 mA
Audio Performance
Key Features
- Miniature
- Variable-Mu
- Directly Heated
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Condition 1 | 45V | - | - | - | 1.7mA |
| Condition 2 | 67.5V | - | - | - | 3.4mA |
| Condition 3 | 90V | - | - | - | 1.8mA |
| Condition 4 | 90V | 1050 | 500000 | - | 3.5mA |
Application Notes
The screen grid may be supplied from a 90 volt source via a series resistor but the screen grid voltage must not exceed 67.5 at zero control grid voltage. Internal screen is connected to pins 1 and 5.
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