4CM300000G

Eimac ceramic-metal high-power broadcast tetrode using multiphase cooling and pyrolytic-graphite grids. Designed for very high power in professional radio-frequency broadcasting service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 15 V / 480 A

Description

The EIMAC 4CM300000G is a multiphase-cooled ceramic/metal high-power broadcast tetrode with pyrolytic-graphite grids.

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: 15 V
Nominal heater current: 480 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: 20000 V
Max screen voltage: 2000 V
Max plate dissipation: 300000 W
Max screen dissipation: 6000 W
Max grid dissipation: 2000 W
Max cathode current: 50 A

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
4.5

Other

Maximum DC plate voltage
20000 V
Maximum DC screen voltage
2000 V
Maximum plate dissipation
300000 W
Maximum screen dissipation
6000 W
Maximum grid dissipation
2000 W
Maximum cathode/plate current
50 A