Tube-number record
12SF5
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12SF5 is a tube type in the TubeDatabase archive (class: High-Mu Triode). Recorded specifications: brand General Electric, construction Triode, base Phenolic, socket Octal, and maximum plate voltage 330 V. The archive does not yet hold a photographed example of this type.
BrandGeneral Electric
ClassHigh-Mu Triode
BaseOctal
Filament12.6 V @ 150 mA
Construction
Primary TypeTriode
EnvelopeMT-8 Metal Shell
Base MaterialPhenolic
SectionsSingle
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage330 V
H-C Voltage90 V
Audio Performance
Typical THD5%
Key Features
- High gain audio-frequency amplifier
- Resistance-coupled amplifier circuits
- Metal Shell
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 100 V | 1200 | 85000 | 100 | 0.4 mA |
| Class A Amplifier | 250 V | 1500 | 66000 | 100 | 0.9 mA |
Application Notes
Especially useful in resistance-coupled amplifier circuits in a-c/d-c or battery operated equipment.
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