6F7
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BrandSylvania
ClassTriode-Pentode
BaseSmall 7-pin (T-E)
Filament6.3V @ 300mA
Construction
Primary TypeTriode-Pentode
EnvelopeST-12C
Sections2
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage100 V
Audio Performance
Key Features
- Indirectly heated
- Independent outputs per section (except common cathode)
- Triple-grid pentode and triode in one envelope
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Section Triode | 100V | 525 | 16200 | 8.5 | 3.5mA |
| Section Pentode (Low Voltage) | 100V | 1050 | 290000 | 300 | 6.3mA |
| Section Pentode (High Voltage) | 250V | 1100 | 850000 | 900 | 6.5mA |
| Frequency Converter (Pentode) | 250V | 300 | 2000000 | - | 2.8mA |
Application Notes
The pentode section can function in HF or MF and the triode section as a polarized detector. Can also function as a frequency converter with the triode as an oscillator and pentode as a detector.
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