Tube-number record
RK-20
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RK-20 is a tube type in the TubeDatabase archive (class: RF Power Pentode). Recorded specifications: brand Raytheon, construction Pentode, base Raytheon 4-Pillar, socket 5-pin, maximum plate voltage 1250 V, and maximum plate dissipation 40 W. The archive does not yet hold a photographed example of this type.
BrandRaytheon
ClassRF Power Pentode
Base5-pin
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialRaytheon 4-Pillar
SectionsSingle
Filament / Heater
MaterialThoriated
Absolute Maximum Ratings
Plate Voltage1250 V
Plate Dissipation40 W
Grid 2 Voltage300 V
Audio Performance
Key Features
- Thoriated filament
- Suppressor grid brought out to separate base pin
- Low control grid-plate capacitance
- Four-pillar construction
- Crystal or Electron Coupled Oscillator compatibility
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Power Amplifier Class B Telephony | 1250 V | — | — | — | 43 mA |
| RF Power Amplifier Class C Telegraphy | 1250 V | — | — | — | 92 mA |
| Suppressor Modulated RF Power Amplifier Class C Telephony | 1250 V | — | — | — | 43 mA |
| Combined Plate and Screen Modulation Class C Telephony | 900 V | — | — | — | 68 mA |
Application Notes
The low control grid-plate capacitance makes possible the use of a plate load circuit tuned to the fundamental in crystal or electron coupled oscillator circuits such as the Tri-Tet. Shielding of the grid input tuning system from the plate tuning apparatus is desirable for stability.
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