Tube-number record
HF-140 / 211-D
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BrandAmperex
ClassTransmitting Tube
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage1250 V
Plate Dissipation100 W
Grid 1 Voltage-400 V
Cathode Current175 mA
Audio Performance
Typical THD5%
Power Output20 W
Key Features
- Radiation Cooled
- Thoriated Tungsten Filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A AF Power Amplifier (1) | 1000 V | 4500 | 2666 | 12 | 70 mA |
| Class A AF Power Amplifier (2) | 1250 V | 4500 | 2666 | 12 | 60 mA |
| Class C Telegraphy (1) | 1000 V | — | — | 12 |
Application Notes
For Replacement Only, Superseded by Type HF-120/211-B
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