Tube-number record
ML-7479
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BrandMachlett
ClassPower Triode
BaseCoaxial
Construction
Primary TypeTriode
EnvelopeCeramic
SectionsSingle
Filament / Heater
Materialthoriated-tungsten
Absolute Maximum Ratings
Plate Voltage12500 V
Plate Dissipation50000 W
Grid 1 Voltage-2000 V
Cathode Current8000 mA
Audio Performance
Power Output93000 W
Key Features
- Vapor-cooled anode
- Low-inductance r-f terminals
- Ceramic envelope
- Thoriated-tungsten filament
- Sturdy coaxial grid
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Telegraphy | 12000 V | — | — | 20 | 6400 mA |
| Class C Telephony | 8500 V | — | — | 20 | 4800 mA |
Application Notes
The ML-7479 is conservatively designed for 40-50 kW industrial heating and AM broadcast service. Efficient cooling is accomplished by vaporization of water in a boiler and transport to a secondary cooling circuit at approximately 100°C.
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