12SR7
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BrandGeneral Electric
ClassDuplex-Diode Triode
Base8-Pin Phenolic
Filament12.6V @ 150mA
Construction
Primary TypeTriode
EnvelopeMT-8 Metal Shell
Base MaterialPhenolic
SectionsDuplex-Diode Triode
Filament / Heater
Heater NotesA-C or D-C
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.5 W
H-C Voltage90 V
Audio Performance
Typical THD5%
Power Output0.3 W
Key Features
- Duplex-diode medium-mu triode
- Combined detector
- Audio amplifier
- Automatic-volume-control tube
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 250V | 1900 | 8500 | 16 | 9.5mA |
Application Notes
The d-c resistance in the grid circuit should not exceed 1.0 megohm under rated maximum conditions. Cathode is coated unipotential.
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