Tube-number record
TETRODE
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BrandMachlett
ClassTransmitting Tube
Construction
Primary TypeTetrode
EnvelopeCeramic-Metal
SectionsSingle
Filament / Heater
MaterialThoriated-tungsten
Absolute Maximum Ratings
Plate Voltage18000 V
Plate Dissipation175000 W
Grid 2 Voltage2500 V
Grid 1 Voltage-1200 V
Cathode Current375000 mA
Audio Performance
Power Output658000 W
Key Features
- Vapor-cooled anode
- Low-inductance rf terminals
- Thoriated-tungsten filaments
- Low-loss alumina ceramics
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class C Telegraphy | 18000 V | — | — | 5 | 25000 mA |
| Class C Telephony (Plate-Modulated) | 13000 V | — | 323 | 5 | 19000 mA |
| Linear RF AB SSB | 18000 V | — | 435 | 5 | 22000 mA |
Application Notes
The ML-8785 is a general purpose tetrode capable of 350 kW continuous output as a Class C amplifier or oscillator. Maximum ratings apply up to 30 MHz.
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