Tube-number record
RADIAL-BEAM POWER TETRODE
0 archive entries
RADIAL-BEAM POWER TETRODE is a tube type in the TubeDatabase archive (class: Transmitting Tube). Recorded specifications: brand Eimac, construction Tetrode, base 5-pin metal shell, socket Special / none, maximum plate voltage 6000 V, and maximum plate dissipation 1000 W. The archive does not yet hold a photographed example of this type.
BrandEimac
ClassTransmitting Tube
BaseSpecial / none
Construction
Primary TypeTetrode
EnvelopeGlass
Base Material5-pin metal shell
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage6000 V
Plate Dissipation1000 W
Grid 2 Voltage1000 V
Grid 1 Voltage-500 V
Cathode Current700 mA
Audio Performance
Power Output3900 W
Key Features
- Radial-beam
- Efficient operation into VHF range
- High power output
- Forced-air cooling
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class-C Telegraphy | 3000 V | 10000 | — | — | 700 mA |
| Class-C Telegraphy | 4000 V | 10000 | — | — | 700 mA |
| Class-C Telegraphy | 5000 V | 10000 | — | — | 700 mA |
Application Notes
Cooling of the tube is accomplished by radiation from the plate and by circulation of forced-air through the base and around the envelope. Cooling can be simplified through the use of the Eimac SK-500 Air-System socket.
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