Tube-number record
278
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ClassPentode
Base6-pin
Filament6.3 V @ 0.3 mA
Construction
Primary TypePentode
EnvelopeST-12
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated cathode
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage100 V
Audio Performance
Key Features
- Triple-Grid
- Super-Control Amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 250 V | 1450 | 800000 | — | 7 mA |
Application Notes
Used primarily as a radio-frequency amplifier and intermediate-frequency amplifier in AC receivers.
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