Tube-number record
HF-300
0 archive entries
HF-300 is a tube type in the TubeDatabase archive (class: Transmitting Tube). Recorded specifications: brand Amperex, construction Triode, base Standard Jumbo, socket 4-pin, maximum plate voltage 3000 V, and maximum plate dissipation 200 W. The archive does not yet hold a photographed example of this type.
BrandAmperex
ClassTransmitting Tube
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialStandard Jumbo
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
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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