4CW250000A

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

Ceramic/metal water-cooled power tetrode for 250–500 kW output service, suitable for RF amplification/oscillation, AF modulation, and pulse modulator/regulator applications; non-VacIon-pump version.

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

Published absolute maximum ratings promoted from the applicable service tables; pulse-service maxima are used only where explicitly noted in the tube note.

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

Other

Heater/Filament Voltage
12 V
Heater/Filament Current
660 A
At 12.0 V nominal
Frequency for Maximum Ratings
50 MHz
Maximum Plate Voltage
40000 V
Highest published applicable absolute maximum
Maximum Screen Voltage
2500 V
Highest published applicable absolute maximum
Maximum Plate Dissipation
250000 W
Maximum Screen Dissipation
3500 W
Maximum Grid Dissipation
1500 W
Maximum DC Plate Current
40 A
Peak Cathode Current
350 A
Pulse service
Pulse Plate Voltage
40000 V
PulseModulatorOrRegulator
Peak Cathode Current
350 A
PulseModulatorOrRegulator
Plate Voltage
20000 V
ClassAB;RFLinearAmplifier;HighOperatingPoint
Screen Voltage
1800 V
ClassAB;RFLinearAmplifier
Plate Output Power
330000 W
ClassAB;RFLinearAmplifier;HighOperatingPoint

Characteristic

Grid-Screen Amplification Factor
4.5

Capacitance

Input Capacitance
765 pF
GroundedCathode
Output Capacitance
124 pF
GroundedCathode
Feedback Capacitance
6 pF
GroundedCathode