279A
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BrandWestern Electric
ClassFilamentary air-cooled triode
BaseW.E. 142A
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation1200 W
Cathode Current800 mA
Audio Performance
Typical THD5%
Power Output2200 W
Key Features
- Thoriated tungsten filament
- Air-cooled
- Suitable for RF amplification, modulation, or oscillation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Audio Amplifier (Condition 1) | 2500V | 5000 | 2000 | 10 | 300mA |
| Class A Audio Amplifier (Condition 2) | 2000V | 5000 | 2000 | 10 | 375mA |
| Class B Audio Amplifier (Condition 1, 2 tubes) | 2500V | - | - | - | 800mA |
| Class B RF Amplifier (Condition 1) | 3000V | - | - | - | 600mA |
| Class C RF Oscillator - Unmodulated (Condition 1) | 3000V |
Application Notes
The filament should be operated at the rated voltage measured at the tube terminals. A 5% decrease in filament voltage reduces thermionic emission approximately 25%. A free circulation of air must be provided to ensure adequate cooling.
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