Tube-number record
HF-140 / 211-D
0 archive entries
HF-140 / 211-D is a tube type in the TubeDatabase archive (class: Transmitting Tube). Recorded specifications: brand Amperex, construction Triode, socket 4-pin, maximum plate voltage 1250 V, and maximum plate dissipation 100 W. The archive does not yet hold a photographed example of this type.
BrandAmperex
ClassTransmitting Tube
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage1250 V
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For Replacement Only, Superseded by Type HF-120/211-B
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