Tube-number record
HF-300
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BrandAmperex
ClassTransmitting Tube
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialStandard Jumbo
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation200 W
Grid 1 Voltage-500 V
Cathode Current275 mA
Audio Performance
Power Output740 W
Key Features
- Radiation Cooled
- High ratio of transconductance to interelectrode capacitance
- Efficient high frequency generator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B Audio Frequency Power Amplifier | 2500 V | 5600 | — | 23 | 430 mA |
| Class C Telegraphy | 3000 V | — | — | 23 | 250 mA |
| Class C Telephony (Plate Modulated) | 2000 V | — | — | 23 |
Application Notes
The HF-300 has found favor with many broadcasters and transmitter designers as a substitute for the 204A.
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