12SJ7
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BrandGeneral Electric
ClassSharp cut-off radio-frequency-amplifier pentode
BaseOctal
Filament12.6V @ 0.15mA
Construction
Primary TypePentode
EnvelopeMetal Shell
Base MaterialPhenolic
SectionsSingle
Filament / Heater
Heater NotesDirect connection between heater and cathode is recommended.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.5 W
Grid 2 Voltage125 V
H-C Voltage90 V
Audio Performance
Typical THD5%
Key Features
- Sharp cut-off
- High-gain amplifier
- Metal shell
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Connection | 100V | 1575 | 700000 | - | 2.9mA |
| Pentode Connection | 250V | 1650 | 1000000 | - | 3mA |
| Triode Connection | 180V | 2300 | 8250 | 19 | 6mA |
| Triode Connection | 250V | 2500 | 7600 | 19 | 9.2mA |
Application Notes
Capable of delivering a large audio-frequency output voltage of good quality with a fairly small radio-frequency signal input.
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