Tube-number record
BTL 15-3 / BTL 15-4
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BrandBrown Boveri
ClassTransmitting Triode
Construction
Primary TypeTriode
EnvelopeGlass/Metal
Base MaterialMetal
Sections1
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage12000 V
Plate Dissipation17000 W
Grid 1 Voltage-1200 V
Cathode Current35000 mA
Audio Performance
Power Output66000 W
Key Features
- Air-cooled
- Thoriated tungsten filament
- Directly heated
- BTL 15-3 Horizontal fins
- BTL 15-4 Vertical fins
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C RF unmodulated | 12000 V | 45000 | — | 35 | 6000 mA |
| Class B AF Power Amplifier (2 tubes) | 12000 V | — | — | — | 1200 mA |
Application Notes
Applications include broadcast RF and AF and industrial heating/telecommunications.
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