WT77
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BrandMarconi
ClassVariable-Mu R.F. Pentode
BaseB7G
Filament6.3V @ 0.2mA
Construction
Primary TypePentode
EnvelopeTubular
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.5 W
Grid 2 Voltage250 V
Audio Performance
Key Features
- Miniature
- Variable-Mu
- Indirectly heated
- Internal screen connected to pin 6
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard | 200V | 2500 | 500000 | - | 8mA |
Application Notes
The maximum D.C. resistance between control grid and cathode must not exceed 4M Ohms.
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