Tube-number record
6681/12AX7
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BrandSYLVANIA
ClassHigh mu duo triode
BaseNoval (B9A)
Filament12.6 V @ 150 mA
Construction
Primary TypeTriode
EnvelopeT-6 1/2
Sections2
Filament / Heater
Heater NotesSeries/Parallel operation
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation1.1 W
Grid 1 Voltage55 V
H-C Voltage200 V
Audio Performance
Key Features
- Designed specifically for mobile communications equipment
- Capable of withstanding appreciable on-off cycling
- High mu duo triode
- Intended for use as an audio amplifier or phase inverter
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 100 V | 1250 | 80000 | 100 | 0.5 mA |
| Class A1 Amplifier | 250 V | 1600 | 62500 | 100 | 1.2 mA |
Application Notes
The 6681/12AX7 may be operated without serious degradation under normal variations in supply voltage as encountered with automotive electrical systems.
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