Tube-number record
438
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BrandWestern Electric
ClassPentode
BaseMiniature 7-pin (B7G)
Filament10 V @ 0.075 mA
Construction
Primary TypePentode
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated cathode
Absolute Maximum Ratings
Plate Voltage180 V
Plate Dissipation2 W
Grid 2 Voltage180 V
Audio Performance
Key Features
- High transconductance
- Low heater power
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 150 V | 1250 | 500000 | — | 4.8 mA |
Application Notes
Commonly used in carrier system applications and high-frequency amplifiers.
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