12AD7
6 Tubes in archive
BrandSylvania
ClassHigh Mu Double Triode
BaseSmall Button 9-Pin
Filament12.6V @ 225mA
Construction
Primary TypeDouble Triode
EnvelopeMiniature
Base MaterialGlass
Sections2
Filament / Heater
Heater NotesHeater sections can be operated in series (12.6V) or parallel (6.3V).
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
Grid 1 Voltage-50 V
H-C Voltage200 V
Audio Performance
Key Features
- High Mu
- Non-microphonic
- Hum-free
- Low level audio preamplifier service
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 250V | 1600 | 62500 | 100 | 1.25mA |
Application Notes
Rigorously controlled to provide hum and microphonic free operation in low level audio preamplifier service.
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