12AU7
59 Tubes in archive
BrandBrimar
ClassMiniature Twin Triode
BaseB9A
Filament12.6V @ 150mA
Construction
Primary TypeTwin Triode
EnvelopeT6
Base MaterialGlass
Sections2
Filament / Heater
Heater NotesCenter tap for series or parallel operation
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.75 W
Grid 1 Voltage-150 V
Cathode Current20 mA
H-C Voltage250 V
Audio Performance
Power Output1.2 W
Key Features
- Miniature indirectly heated twin triode
- Separate structures
- Heater centre tap for AC or AC/DC
- High voltage gain
- Low distortion
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 100V | 3100 | 6250 | 19.5 | 11.8mA |
| Class A1 Amplifier | 250V | 2200 | 7700 | 17 | 10.5mA |
Application Notes
Suitable for normal amplifier, resistance capacity coupled amplifier, paraphase amplifier, oscillator, and frequency multiplier. Units are mounted side by side with separate heaters but common heater pin connections.
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