8909

High-power forced-air ceramic/metal radial-beam tetrode, co-designated 4CX5000J, providing multi-kilowatt transmitting or industrial power from a rugged external-anode structure.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 7.5 V / 103 A

Description

High-power forced-air ceramic/metal radial-beam tetrode; shared 8909/4CX5000J designation.

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: 103 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

Tetrode

X-ray radiationInterelectrode capacitances

Amplification factor: 4.5
Max plate voltage: 7500 V
Max screen voltage: 1500 V
Max plate dissipation: 6000 W
Max screen dissipation: 250 W
Max grid dissipation: 75 W

Promoted values are taken from printed General Characteristics / Maximum Ratings. Additional published conditions and operating data are preserved in parameters.

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

Tetrode

Capacitance

Input Capacitance
120 pF

Other

Frequency Maximum
100 MHz
Typical Plate Voltage
4050 V
ClassAB1
Typical Screen Voltage
800 V
ClassAB1
Typical Zero-Signal Plate Current
750 mA
ClassAB1