4CW100000D

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: 10 V / 205 A

Description

Ceramic/metal liquid-cooled power tetrode for 100–200 kW output service, including Class-C RF, Class-AB linear/AF, plate/screen modulation, and pulse modulator-regulator service.

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: 10 V
Nominal heater current: 205 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: 100000 W
Max screen dissipation: 1750 W
Max grid dissipation: 500 W
Max cathode current: 200 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
10 V
Heater/Filament Current
205 A
At 10.0 V nominal
Frequency for Maximum Ratings
30 MHz
Maximum Plate Voltage
40000 V
Highest published applicable absolute maximum
Maximum Screen Voltage
2500 V
Highest published applicable absolute maximum
Maximum Plate Dissipation
100000 W
Maximum Screen Dissipation
1750 W
Maximum Grid Dissipation
500 W
Maximum DC Plate Current
15 A
Peak Cathode Current
200 A
Pulse service
Pulse Plate Voltage
40000 V
PulseModulatorOrRegulator
Peak Cathode Current
200 A
PulseModulatorOrRegulator
Plate Voltage
15000 V
ClassC;RFPowerAmplifier
Screen Voltage
1500 V
ClassC;RFPowerAmplifier
Plate Output Power
165000 W
ClassC;RFPowerAmplifier;HighOperatingPoint

Characteristic

Grid-Screen Amplification Factor
4.5

Capacitance

Input Capacitance
440 pF
GroundedCathode
Output Capacitance
55 pF
GroundedCathode
Feedback Capacitance
2.4 pF
GroundedCathode
Input Capacitance
175 pF
GroundedGrid
Output Capacitance
57 pF
GroundedGrid
Feedback Capacitance
0.5 pF
GroundedGrid