Tube-number record
438
0 archive entries
438 is a tube type in the TubeDatabase archive (class: Pentode). Recorded specifications: brand Western Electric, construction Pentode, socket Miniature 7-pin (B7G), maximum plate voltage 180 V, and maximum plate dissipation 2 W. The archive does not yet hold a photographed example of this type.
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
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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