849-A
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BrandAmperex
ClassTransmitting Tube
BaseStandard Jumbo 3 Pin
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage4000 V
Plate Dissipation500 W
Grid 1 Voltage-500 V
Cathode Current500 mA
Audio Performance
Typical THD4%
Power Output150 W
Key Features
- Radiation cooled
- Thoriated tungsten filament
- Supersedes older 849 model
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| A.F. Power Amplifier Class A | 2500V | 7600 | - | 19 | 135mA |
| A.F. Power Amplifier Class A | 3000V | 7600 | - | 19 | 120mA |
| A.F. Power Amplifier Class A | 4000V | 7600 | - | 19 | 100mA |
| R.F. Power Amplifier Class C Telegraphy | 3000V | - | - | - | 500mA |
Application Notes
The Amperex 849-A is designed for A.F. Power Amplifier, Modulator, R.F. Power Amplifier or Oscillator service.
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