4CX250BC

High-power ceramic/metal transmitting tetrode designed for RF power amplification, linear amplification, oscillation, modulation, broadcast, or related high-power service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: RADIALRING9
Base pins: 9
Nominal heater: 6 V / 2.6 A

Description

The EIMAC 4CX250BC is a forced-air-cooled ceramic/metal radial-beam power tetrode for oscillator, amplifier and modulator service.

Socket description

9-contact radial-ring transmitting-tube base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: RADIALRING9
Base pins: 9
Nominal heater voltage: 6 V
Nominal heater current: 2.6 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: 5
Max plate voltage: 2000 V
Max screen voltage: 400 V
Max plate dissipation: 250 W
Max screen dissipation: 12 W
Max grid dissipation: 2 W
Max cathode current: 250 mA

Promoted from printed general-characteristics and absolute-maximum-ratings blocks.

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

Characteristic

Amplification factor
5

Other

Maximum DC plate voltage
2000 V
Maximum DC screen voltage
400 V
Maximum plate dissipation
250 W
Maximum screen dissipation
12 W
Maximum grid dissipation
2 W
Maximum cathode/plate current
250 mA