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7843

Conduction-cooled beam-power tetrode for UHF linear amplification, rated for full power input to about 1.215 GHz and approximately 115 W plate dissipation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 26.5 V / 530 mA

Description

The 7843 is a beam-power transmitting tube. The supplied datasheet was processed for heater or filament data, maximum ratings, operating characteristics, capacitances where published, and service-specific power or frequency data.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 26.5 V
Nominal heater current: 530 mA
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

Beam Power

X-ray radiationInterelectrode capacitances

Amplification factor: 18
Max plate voltage: 1000 V
Max screen voltage: 300 V
Max plate dissipation: 115 W
Max screen dissipation: 4.5 W
Max grid dissipation: 1 W
Max cathode current: 180 mA

Promoted fields populated from published ratings/characteristics; additional published values retained in TUBE_SECTION_PARAMETER.

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

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Capacitance

Control Grid to Cathode Capacitance
13 pF
Control Grid to Screen Grid Capacitance
17.5 pF

Characteristic

Cathode Warmup Time Minimum
60 s

Other

Frequency Full-Rated Power Input
1215 MHz
Maximum DC Plate Current
180 mA
Typical Useful Power Output
80 W
Frequency=400MHz
Typical Useful Power Output
40 W
Frequency=1200MHz

Data set 02

1971 RCA HB3 Binder 6 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Maximum DC Plate Voltage
1000 V
Conduction-cooled linear RF power amplifier
Maximum DC Screen Voltage
300 V
Conduction-cooled linear RF power amplifier
Maximum DC Plate Current
180 mA
Conduction-cooled linear RF power amplifier
Plate Dissipation
115 W
Conduction-cooled linear RF power amplifier
CW Power Output at 400 MHz
80 W
Conduction-cooled linear RF power amplifier
CW Power Output at 1215 MHz
40 W
Conduction-cooled linear RF power amplifier

Characteristics

Mu Factor, Screen to Control Grid
18
Conduction-cooled linear RF power amplifier
Minimum Heating Time
60 s
Conduction-cooled linear RF power amplifier