Tube-number record
HF-120/211-B
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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
- Standard Jumbo Base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| A.F. Power Amplifier - Class A | 1250 V | 4500 | — | 12 | 60 mA |
| R.F. Power Amplifier - Class C Telegraphy | 1250 V | — | — | — | 166 mA |
| A.F. Power Amplifier - Class B (Two Tubes) | 1250 V | — | — | — |
Application Notes
Mounting Position: Vertical (base up or down); Horizontal (plane of electrodes vertical).
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