Tube-number record
RK-37
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BrandRaytheon
ClassTriode
Base4-pin
Construction
Primary TypeTriode
EnvelopeHard Glass
Base MaterialIsolantite
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage1500 V
Plate Dissipation50 W
Grid 1 Voltage-50 V
Cathode Current125 mA
Audio Performance
Power Output200 W
Key Features
- Thoriated tungsten filament
- Tantalum plate
- Tantalum grid
- Hard glass bulb
- Isolantite base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R-F Power Amplifier or Oscillator - Class C Telegraphy | 1500 V | — | — | — | 115 mA |
| R-F Power Amplifier - Class C Telephony (Plate Modulation) | 1250 V | — | — | — | 100 mA |
| R-F Power Amplifier - Class C Telephony (Grid Modulation) | 1500 V | — | — |
Application Notes
The RK-37 can be operated at maximum ratings up to 60 megacycles. For frequencies between 60 and 120 megacycles, plate voltage should not exceed 1000V. Above 120 megacycles, plate voltage should not exceed 750V. At least 35V of fixed bias is recommended at 1500V plate voltage for protection.
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