Tube-number record
ML-7480A
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BrandMachlett
ClassGeneral Purpose Triode
Construction
Primary TypeTriode
EnvelopeCeramic
Sections1
Filament / Heater
MaterialThoriated-tungsten
Absolute Maximum Ratings
Plate Voltage16000 V
Plate Dissipation80000 W
Grid 1 Voltage-3500 V
Cathode Current11000 mA
Audio Performance
Power Output152000 W
Key Features
- Vapor-cooled
- Ceramic envelope
- Sturdy coaxial grid and cathode
- Stress-free thoriated-tungsten filaments
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Audio Amplifier (Two Tubes) | 12000 V | — | — | 20 | 10000 mA |
| Class C RF Power Amplifier (Telegraphy) | 15000 V | — | 970 | 20 | 7000 mA |
| Class C Telephony (Plate-Modulated) | 9500 V | — | 510 | 20 |
Application Notes
The ML-7480A is a general-purpose vapor-cooled triode designed for 50-75 kW industrial heating and AM broadcasting. It requires aging and is equipped with x-ray warnings for operations above 15 kV.
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