6F31
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BrandTESLA
ClassHigh-frequency pentode - remote-cut-off
BaseMiniature 7-pin
Filament6.3V @ 300mA
Construction
Primary Typepentode
EnvelopeGlass
Base MaterialGlass
Sections1
Filament / Heater
Heater NotesIndirectly heated cathode
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation3 W
Grid 2 Voltage125 V
Grid 1 Voltage-50 V
H-C Voltage150 V
Audio Performance
Key Features
- Separate suppressor grid pin
- Miniature 7-pin base
- Indirectly heated oxygen cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF/IF Amplifier - Case 1 | 100V | 4300 | 250000 | - | 10.8mA |
| RF/IF Amplifier - Case 2 | 250V | 4400 | 1000000 | - | 11mA |
Application Notes
Designed for HF and MF amplifiers in receivers.
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