Tube-number record
TA 20/250
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BrandPHILIPS
ClassTRIODE
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeGlass and Metal (Water Cooled)
SectionsSingle
Filament / Heater
MaterialTungsten
Absolute Maximum Ratings
Plate Voltage20000 V
Plate Dissipation130000 W
Audio Performance
Key Features
- Water cooled
- Tungsten filament
- High power transmitting tube
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| HF class C telegraphy | 20000 V | 25000 | — | 45 | 16500 mA |
| HF class B telephony | 20000 V | 25000 | — | 45 | 9300 mA |
| HF class C anode modulation | 12000 V | 25000 | — | 45 | 8500 mA |
Application Notes
Commonly used as a modulator or H.F. amplifier in water-cooled transmitters.
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