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4D22

Beam-power transmitting tube for Class-C RF amplification, oscillator, frequency-multiplier, and modulated RF service, with approximately 50 W plate dissipation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: SEPTAR7
Base pins: 7
Nominal heater: 25.2 V / 800 mA

Description

Beam-power RF tube for Class-C amplification, oscillator, frequency-multiplier and modulated RF service.

Socket description

Septar 7-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: SEPTAR7
Base pins: 7
Nominal heater voltage: 25.2 V
Nominal heater current: 800 mA
Parallel heater voltage: 12.6 V
Parallel heater current: 1.6 A
Series capable: Yes

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

Beam Power

X-ray radiationInterelectrode capacitances

Max plate voltage: 750 V
Max screen voltage: 350 V
Max plate dissipation: 50 W
Max screen dissipation: 14 W
Max grid dissipation: 0.75 W
Max cathode current: 300 mA

Published ratings and characteristics promoted where clearly stated; identical repeated sections compressed when 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

Beam Power

Characteristics

Heater or filament voltage
25.2 V
Published nominal value
Heater or filament current
800 mA
Published nominal value

Other

Maximum plate dissipation
50 W
Published maximum rating