12FR8
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BrandGeneral Electric
ClassDiode-Triode-Pentode
BaseE9-1
Filament12.6V @ 320mA
Construction
Primary TypeDiode-Triode-Pentode
EnvelopeT-6 1/2 Glass
Base MaterialSmall Button 9-Pin
SectionsTriode, Pentode, Diode
Filament / Heater
Heater NotesIntended for operation from 12V storage battery; heater voltage range 10.0V to 15.9V.
Absolute Maximum Ratings
Plate Voltage16 V
Grid 2 Voltage16 V
H-C Voltage16 V
Audio Performance
Key Features
- Miniature diode-triode-pentode
- Designed for 12V automobile receivers
- Operates plate and screen directly from 12V battery
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section | 12.6V | 2700 | 400000 | - | 1.9mA |
| Triode Section | 12.6V | 1200 | - | 10 | 1mA |
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