Tube-number record
TB 2/250
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BrandPhilips
ClassTransmitting Tube
Construction
Primary TypeTriode
EnvelopeGlass
Sections1
Filament / Heater
MaterialThoriated
Absolute Maximum Ratings
Plate Voltage2500 V
Plate Dissipation200 W
Cathode Current225 mA
Audio Performance
Key Features
- Thoriated filament
- High emission
- Short wave operation down to 14m
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Oscillator/Amplifier (French Specs) | 2000 V | 3000 | 8300 | 25 | 125 mA |
| Maximum Slope Condition | 2000 V | 8000 | — | 25 | — |
| German Specs (Standard) | 2000 V | 4000 | 6000 | 25 | — |
Application Notes
Used as an oscillator, HF power amplifier, modulator, or high-power LF amplifier for large loudspeaker systems. Can also act as a rectifier for 225 mA.
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