Tube-number record
BTL 25-3
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BrandBrown Boveri
ClassAir-Cooled Transmitting Triode
Construction
Primary TypeTriode
EnvelopeGlass-Metal
Base MaterialMetal
Sections1
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage15000 V
Plate Dissipation25000 W
Grid 1 Voltage-1500 V
Cathode Current9000 mA
Audio Performance
Power Output100000 W
Key Features
- Thoriated tungsten filament
- Forced air cooling
- Directly heated
- Class C and Class B operation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C RF Unmodulated (Grounded Cathode) | 15000 V | 70000 | — | 40 | 8700 mA |
| Class B AF Power Amplifier (Push-Pull, 2 Tubes) | 12500 V | 70000 | 2600 | 40 | 11000 mA |
| Class C RF Anode-Modulated | 12500 V | 70000 | — | 40 |
Application Notes
Suitable for broadcast RF/AF and industrial HF/LF applications. Vertical mounting required, anode downwards.
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