4CW250000B

High-power transmitting tetrode designed for RF amplification and modulation, with explicit pulse-modulator and regulator service ratings.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 12 V / 660 A

Description

The EIMAC 4CW250,000B is the water-cooled companion to the 4CV250,000B on the same technical sheet, sharing the published electrical ratings while using an anode water jacket.

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: 12 V
Nominal heater current: 660 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: 40000 V
Max screen voltage: 2500 V
Max plate dissipation: 250000 W
Max screen dissipation: 3500 W
Max grid dissipation: 1500 W
Max cathode current: 350 A

MaxPlateVoltage=40000 V is the explicit pulse-modulator/regulator absolute maximum; ordinary RF maximum is 20000 V.

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

Frequency for Maximum Ratings
50 MHz

Capacitance

Input Capacitance
760 pF
Grounded cathode
Output Capacitance
124 pF
Grounded cathode
Feedback Capacitance
6 pF
Grounded cathode

Other

Maximum DC Plate Voltage
20000 V
RF/AF service
Peak Cathode Current
350 A
PulseModulatorOrRegulator