Tube-number record
251A
0 archive entries
251A 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 1000 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
Sections1
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 | 3800 | 2750 | 10.5 | 240 mA |
| Class A Audio Amplifier (Condition 2) | 2000 V | — | — | — | 300 mA |
| Class B Audio Amplifier (Balanced 2 Tube) | 3000 V | — | 1125 | — |
Application Notes
The tube should be mounted in a vertical position. A free circulation of air must be provided to insure adequate cooling. Filament may be operated on AC or DC.
Datasheets
Datasheet: 251A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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