Tube-number record
ML-8547
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ML-8547 is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Machlett, year 1964, construction Triode, socket Coaxial, maximum plate voltage 11000 V, and maximum plate dissipation 175000 W. The archive does not yet hold a photographed example of this type.
BrandMachlett
ClassTriode
BaseCoaxial
Construction
Primary TypeTriode
EnvelopeCeramic
Sections1
Filament / Heater
MaterialThoriated-tungsten
Absolute Maximum Ratings
Plate Voltage11000 V
Plate Dissipation175000 W
Grid 1 Voltage-1200 V
Cathode Current40000 mA
Audio Performance
Power Output300000 W
Key Features
- Water-cooled
- Coaxial terminals
- High plate current at low voltage
- Stress-free thoriated-tungsten filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier and Modulator Class B (Two Tubes) | 10000 V | — | — | 14 | 48000 mA |
| RF Power Amplifier Class C Telegraphy | 11000 V | — | 238 | 14 | 25000 mA |
| Pulse Modulator | 16000 V | — | — | — | 350000 mA |
Application Notes
For cathode currents in excess of 350 amps, filament voltage must be 15.0 volts. The anode incorporates an integral water jacket and is designed to dissipate 175 kW.
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