12A5
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BrandSylvania
ClassPower Amplifier Pentode
BaseSmall 7-pin
Filament6.3V @ 0.6mA
Construction
Primary TypePentode
EnvelopeST-12
SectionsSingle
Filament / Heater
Heater NotesFilaments can be connected in series (12.6V/0.3A) or parallel (6.3V/0.6A).
Absolute Maximum Ratings
Plate Voltage180 V
Plate Dissipation8.25 W
Grid 2 Voltage180 V
Audio Performance
Typical THD11%
Power Output3.4 W
Key Features
- Series/Parallel heater capability
- Universal receiver application
- Automobile receiver application
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 | 100V | 1700 | 50000 | - | 7mA |
| Class A1 | 180V | 2400 | 35000 | - | 45mA |
Application Notes
Recommended DC grid circuit resistance below 0.5 Megohms for fixed bias, or 1.0 Megohm for auto-bias. In automobile applications, 2.2W output can be achieved with 36mA cathode current for economy.
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