Tube-number record
TB 2,5/400
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ClassRF Power Triode
Base5-pin
Construction
Primary TypeTriode
Envelopeglass
Sections1
Filament / Heater
Materialthoriated tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation150 W
Grid 1 Voltage-300 V
Cathode Current255 mA
Audio Performance
Typical THD5%
Power Output700 W
Key Features
- direct heating
- high-frequency heating application
- thoriated tungsten filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Characteristics | 2500 V | 2800 | — | 25 | 60 mA |
| RF Class C Telegraphy | 2500 V | — | — | — | 205 mA |
| RF Class C Telegraphy | 2000 V | — | — | — | 205 mA |
Application Notes
It is recommended to direct a low-velocity air flow on bottom and top seal if the tube is used at or near limiting values above 50 MHz.
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