Tube-number record
111-H
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BrandAmperex
ClassTransmitting Tube
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage1750 V
Plate Dissipation85 W
Grid 1 Voltage-500 V
Cathode Current160 mA
Audio Performance
Power Output350 W
Key Features
- Radiation Cooled
- Low voltage high current
- High ratio of transconductance to interelectrode capacitance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Audio Amplifier (2 tubes) | 1750 V | 4200 | — | 23 | 270 mA |
| R.F. Power Amplifier Class C Telegraphy | 1500 V | 4200 | — | — | 150 mA |
| Plate Modulated R.F. Power Amplifier Class C | 1250 V | — | — | — |
Application Notes
Designed for R.F. Power Amplifier and Oscillator, and Class B Audio Amplifier or Modulator applications.
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