Tube-number record
TA 4/250
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BrandPhilips
ClassTransmitting Tube
Construction
Primary TypeTriode
EnvelopeGlass
Sections1
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage4000 V
Plate Dissipation250 W
Audio Performance
Key Features
- Directly heated filament
- Suitable for short waves up to 4m
- Rugged construction for aircraft and portable transmitters
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| H.F. Klasse C (telegrafie) | 4000 V | 1200 | 25000 | 30 | — |
| H.F. Klasse B (telefonie) | 4000 V | — | — | — | — |
| H.F. Klasse C (anodemodulatie) | 3500 V | — | — | — | — |
Application Notes
Can be used with TC 05/25 as a driver or MA 4/500 as a modulator using the Heising system.
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