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Power - Pentode (NOT beam) ·Pentode

RK20

Raytheon power pentode designed for RF amplification, oscillation, modulation, and frequency-multiplier service. Its transmitting construction supports multiple radio-frequency generation and power functions.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
7.5 V / 3 A

Description

Power pentode for RF amplification, oscillation, modulation, and frequency-multiplier service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
7.5 V
Nominal heater current
3 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Max plate voltage
1250 V
Max screen voltage
300 V
Max plate dissipation
40 W
Max screen dissipation
15 W
Max cathode current
92 mA

Published electrical limits and characteristics promoted from the approved source; identical repeated sections compressed where applicable.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    7.5 V

    Nominal

  • HeaterCurrentNominal

    3 A

    Nominal

  • Maximum Plate Voltage

    1250 V

  • Maximum Screen Voltage

    300 V

  • Maximum Plate Dissipation

    40 W

  • Maximum Screen Dissipation

    15 W

  • Maximum Cathode Current

    92 mA

  • Maximum Frequency

    60 MHz

    Full ratings or reduced-voltage operation as published

  • Carrier Power Output

    80 W

    ClassC telegraphy

  • SuppressorGridVoltageMaximum

    45 V