Tube-number record
RK-28
0 archive entries
RK-28 is a tube type in the TubeDatabase archive (class: PENTODE). Recorded specifications: brand RAYTHEON, construction Pentode, base isolantite, socket 4-pin, maximum plate voltage 2000 V, and maximum plate dissipation 100 W. The archive does not yet hold a photographed example of this type.
BrandRAYTHEON
ClassPENTODE
Base4-pin
Construction
Primary TypePentode
Envelopehard glass
Base Materialisolantite
Filament / Heater
Materialthoriated tungsten
Absolute Maximum Ratings
Plate Voltage2000 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Telegraphy | 2000 V | — | — | — | 150 mA |
| Suppressor Grid Modulation | 2000 V | — | — | — | 85 mA |
| Control Grid Modulation | 2000 V | — | — | — | 85 mA |
Application Notes
The RK-28 may be operated at maximum ratings up to 30 megacycles. Above 30 megacycles, reduced plate voltage to 1500V is required. Operation above 60 megacycles not recommended. Shielding is desirable. At least 20 volts of fixed bias recommended.
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