Tube-number record
6SF7
0 archive entries
6SF7 is a tube type in the TubeDatabase archive (class: DIODE-SUPER-CONTROL AMPLIFIER PENTODE). Recorded specifications: brand TUNG-SOL, year 1945, construction Multi-section, base WAFER, socket Octal, maximum plate voltage 300 V, and maximum plate dissipation 3.9 W. The archive does not yet hold a photographed example of this type.
BrandTUNG-SOL
ClassDIODE-SUPER-CONTROL AMPLIFIER PENTODE
BaseOctal
Filament6.3 V @ 300 mA
Construction
Primary TypeMulti-section
EnvelopeMETAL
Base MaterialWAFER
Sections2
Filament / Heater
Heater NotesAC OR DC
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation3.9 W
Grid 2 Voltage100 V
Audio Performance
Key Features
- SINGLE-ENDED CONSTRUCTION
- COMBINED IF AMPLIFIER, DETECTOR AND A.V.C. RECTIFIER
- COATED UNIPOTENTIAL CATHODE
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| CLASS A1 AMPLIFIER | 100 V | 1975 | 200000 | — | 12 mA |
| CLASS A1 AMPLIFIER | 250 V | 2050 | 700000 | — | 12.4 mA |
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