Tube-number record
ML-8549
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BrandMachlett
ClassSuper Power Triode
BaseCoaxial
Construction
Primary TypeTriode
EnvelopeCeramic-metal
Base MaterialCoaxial water-cooled
SectionsSingle
Filament / Heater
MaterialThoriated-tungsten
Absolute Maximum Ratings
Plate Voltage65000 V
Plate Dissipation500000 W
Grid 1 Voltage-5000 V
Cathode Current1200000 mA
Audio Performance
Key Features
- Water-cooled anode
- Self-supporting thoriated-tungsten filaments
- Low inductance coaxial terminals
- Ion pump included
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Telephony (Cathode Drive) | 15000 V | — | — | 20 | 90000 mA |
| Class C Telegraphy | 25000 V | — | — | 20 | 115000 mA |
Application Notes
When used as a switch tube in hard-tube pulse modulators, it can deliver more than 60 Mw pulse output. Adequate rayproof shielding for x-rays must be provided.
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