Tube-number record
W107
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BrandMarconi
ClassVariable-Mu R.F. Pentode
BaseMiniature 7-pin (B7G)
Filament12.6 V @ 0.1 mA
Construction
Primary TypePentode
EnvelopeTubular
Sections1
Filament / Heater
Heater NotesIndirectly Heated
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.5 W
Grid 2 Voltage250 V
Cathode Current12 mA
Audio Performance
Key Features
- Miniature
- Variable-Mu
- Low microphony
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 200 V | 2500 | 500000 | — | 8 mA |
| Triode | 200 V | 3000 | 10000 | 30 | — |
Application Notes
R.F. amplifier in equipment designed to minimise microphony.
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