Tube-number record
279A
0 archive entries
279A is a tube type in the TubeDatabase archive (class: Filamentary air-cooled triode). Recorded specifications: brand Western Electric, construction Triode, socket Special / none, maximum plate voltage 3000 V, and maximum plate dissipation 1200 W. The archive does not yet hold a photographed example of this type.
BrandWestern Electric
ClassFilamentary air-cooled triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Audio Amplifier (Condition 1) | 2500 V | 5000 | 2000 | 10 | 300 mA |
| Class A Audio Amplifier (Condition 2) | 2000 V | 5000 | 2000 | 10 | 375 mA |
| Class B Audio Amplifier (Condition 1, 2 tubes) | 2500 V | — | — | — |
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.
Datasheets
Datasheet: 279A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
0 results