12A4
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BrandHytron
ClassMedium-Mu Triode
BaseE9-1 small button 9-pin
Filament12.6V @ 300mA
Construction
Primary TypeTriode
EnvelopeT-6-1/2
SectionsSingle
Filament / Heater
Heater NotesMay be used in 300 mA series heater circuits or 6.3 volt parallel source.
Absolute Maximum Ratings
Plate Voltage500 V
Plate Dissipation6.5 W
Grid 1 Voltage-50 V
Cathode Current40 mA
H-C Voltage180 V
Audio Performance
Key Features
- High perveance
- Medium-mu triode
- Withstands high peak positive plate potentials
- 300 mA series heater compatible
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A-1 Amplifier | 250V | 7800 | - | 20 | 21mA |
| Vertical Deflection Circuit | 250V | - | - | - | 15mA |
Application Notes
Specifically intended for use as a vertical deflection amplifier in television receivers with large deflection angles and low plate supply potentials.
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