Tube-number record
P250A
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BrandNEC
ClassNatural Air Cooled Pentode
BaseSpecial / none
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialMetal/Ceramic
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation420 W
Grid 2 Voltage800 V
Grid 1 Voltage-400 V
Cathode Current500 mA
Audio Performance
Power Output1200 W
Key Features
- Natural Air Cooled
- Thoriated Tungsten Filament
- Up to 25 MHz
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier and Modulator - Class B (Values for two tubes) | 2500 V | — | 6400 | 6.5 | 800 mA |
| RF Power Amplifier and Oscillator - Class C | 3000 V | — | — | — | 480 mA |
Application Notes
Mounting Position: Vertical, Bottom Base Up or Down. Cooling: Convection and Radiation.
Datasheets
Datasheet: P250A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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