Tube-number record
RK-44
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RK-44 is a tube type in the TubeDatabase archive (class: Pentode Power Amplifier Oscillator). Recorded specifications: brand Raytheon, construction Pentode, socket Special / none, maximum plate voltage 500 V, and maximum plate dissipation 12 W. The archive does not yet hold a photographed example of this type.
BrandRaytheon
ClassPentode Power Amplifier Oscillator
BaseSpecial / none
Filament12.6 V @ 700 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesHeater type
Absolute Maximum Ratings
Plate Voltage500 V
Plate Dissipation12 W
Grid 2 Voltage200 V
Cathode Current80 mA
Audio Performance
Key Features
- Isolantite base
- Internal shield
- Heater type
- Suppressor grid modulation
- Control grid modulation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R-F Power Amplifier - Class B Telephony | 500 V | — | — | — | 30 mA |
| Telegraphy - Class C | 500 V | — | — | — | 60 mA |
| Plate & Screen Modulation - Class C | 400 V | — | — | — | 45 mA |
Application Notes
The RK-44 may be operated at maximum ratings at frequencies up to 20 megacycles. Above 20 megacycles, plate voltage should be lowered to prevent excessive plate dissipation. Internal shield is connected to pin 2. At least 15 volts of fixed bias should be used at 500 plate volts for protection.
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