Tube-number record
RK-20A
0 archive entries
RK-20A is a tube type in the TubeDatabase archive (class: Pentode Power Amplifier). Recorded specifications: brand Raytheon, construction Pentode, base Isolantite, 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
ClassPentode Power Amplifier
Base5-pin
Construction
Primary TypePentode
EnvelopeHard glass
Base MaterialIsolantite
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R-F Power Amp Class C Telegraphy | 1250 V | — | — | — | 89 mA |
| Suppressor Grid Modulation | 1250 V | — | — | — | 40 mA |
Application Notes
The RK-20A may be operated at maximum ratings up to 30 megacycles. Between 30 and 60 megacycles, maximum d-c plate voltage should not exceed 900 volts. Shielding of grid input tuning from plate tuning is recommended for stability.
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