12SG7
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BrandGeneral Electric
ClassRadio-Frequency-Amplifier Pentode
BaseOctal
Filament12.6V @ 150mA
Construction
Primary TypeSemi-remote cut-off pentode
EnvelopeMT-8 Metal Shell
Base MaterialPhenolic
SectionsSingle
Filament / Heater
Heater NotesA-C or D-C
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation3.3 W
Grid 2 Voltage220 V
H-C Voltage100 V
Audio Performance
Key Features
- Dual cathode connection
- High gain RF/IF amplifier
- Metal Shell
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 100V | 4100 | 250000 | - | 8.2mA |
| Class A Amplifier | 250V | 4700 | 1000000 | - | 11.8mA |
| Class A Amplifier | 250V | 4000 | 1100000 | - | 9.2mA |
Application Notes
The dual cathode connection provides a method for reducing undesirable coupling between cathode circuits.
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