HF-140 / 211-D
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BrandAmperex
ClassTransmitting Tube
BaseStandard Jumbo 4-Pin Bayonet
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) | 1000V | 4500 | 2666 | 12 | 70mA |
| Class A AF Power Amplifier (2) | 1250V | 4500 | 2666 | 12 | 60mA |
| Class C Telegraphy (1) | 1000V | - | - | 12 | 165mA |
| Class C Telegraphy (2) | 1250V | - | - | 12 | 166mA |
Application Notes
For Replacement Only, Superseded by Type HF-120/211-B
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