Tube-number record
12SJ7
0 archive entries
12SJ7 is a tube type in the TubeDatabase archive (class: Sharp cut-off radio-frequency-amplifier pentode). Recorded specifications: brand General Electric, construction Pentode, base Phenolic, socket Octal, maximum plate voltage 300 V, and maximum plate dissipation 2.5 W. The archive does not yet hold a photographed example of this type.
BrandGeneral Electric
ClassSharp cut-off radio-frequency-amplifier pentode
BaseOctal
Filament12.6 V @ 0.15 mA
Construction
Primary TypePentode
EnvelopeMetal Shell
Base MaterialPhenolic
SectionsSingle
Filament / Heater
Heater NotesDirect connection between heater and cathode is recommended.
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Connection | 100 V | 1575 | 700000 | — | 2.9 mA |
| Pentode Connection | 250 V | 1650 | 1000000 | — | 3 mA |
| Triode Connection | 180 V | 2300 | 8250 | 19 | 6 mA |
Application Notes
Capable of delivering a large audio-frequency output voltage of good quality with a fairly small radio-frequency signal input.
Datasheets
Datasheet: 12SJ7.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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