Tube-number record
ML-893A-R
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BrandMachlett
ClassPower Triode
BaseSpecial / none
Construction
Primary TypeTriode
EnvelopeGlass and Metal
Base MaterialMetal
Sections1
Filament / Heater
MaterialPure-Tungsten
Absolute Maximum Ratings
Plate Voltage20000 V
Plate Dissipation20000 W
Grid 1 Voltage-3000 V
Cathode Current4000 mA
Audio Performance
Power Output70000 W
Key Features
- Forced-air cooled anode
- Pure-tungsten filament
- Designed for modulator, amplifier, or oscillator service
- Max strength cathode design to minimize grid-filament shorts
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| A-F Power Amplifier and Modulator—Class B | 18000 V | — | 8000 | 34.5 | 5500 mA |
| Plate-Modulated R-F Power Amplifier—Class C | 12000 V | — | — | — | 2000 mA |
| R-F Power Amplifier and Oscillator—Class C | 18000 V | — | — | — |
Application Notes
Maximum ratings of 20 kVdc plate voltage and 70 kW plate input apply at frequencies up to 5 mc/sec; operation at 25 mc/sec is permissible with voltage and input reduced to one-half maximum ratings.
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