DA 250
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BrandMarconi
ClassPower Triode
BaseCustom 4-pin with locating pin
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialMetal
SectionsSingle
Filament / Heater
Materialoxide-coated
Absolute Maximum Ratings
Plate Voltage2500 V
Plate Dissipation250 W
Audio Performance
Typical THD5%
Power Output400 W
Key Features
- Directly heated
- Oxide-coated cathode
- Designed for push-pull amplifiers
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class AB1 Push-Pull (Pair) | 2500V | 7000 | 2300 | 16 | 360mA |
| Class AB2 Push-Pull (Pair) | 2500V | 7000 | 2300 | 16 | 500mA |
Application Notes
The peak anode dissipation under Class AB2 push-pull conditions occurs at approximately half full output. Power supply impedance should not exceed 400 Ohms.
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