4CW25000A

Water-cooled radial-beam power tetrode for RF and television linear amplification and pulsed-regulator switching, with full ratings through 110 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 160 A

Description

Ceramic/metal radial-beam power tetrode for RF and television linear-amplifier service and pulsed-regulator switching, with full ratings through 110 MHz.

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: 6.3 V
Nominal heater current: 160 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: 3000 V
Max plate dissipation: 25000 W
Max screen dissipation: 450 W
Max grid dissipation: 200 W
Max cathode current: 80 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
6.3 V
Heater/Filament Current
160 A
At 6.3 V nominal
Frequency for Maximum Ratings
110 MHz
Maximum Plate Voltage
20000 V
Highest published applicable absolute maximum
Maximum Screen Voltage
3000 V
Highest published applicable absolute maximum
Maximum Plate Dissipation
25000 W
Maximum Screen Dissipation
450 W
Maximum Grid Dissipation
200 W
Maximum DC Plate Current
6 A
Peak Cathode Current
80 A
Pulse service
Pulse Plate Voltage
20000 V
PulseModulatorOrRegulator
Pulse Screen Voltage
3000 V
PulseModulatorOrRegulator
Peak Cathode Current
80 A
PulseModulatorOrRegulator
Peak Anode Current
60 A
PulseModulatorOrRegulator
Plate Voltage
10000 V
ClassAB;RFLinearAmplifier
Screen Voltage
1500 V
ClassAB;RFLinearAmplifier
Plate Output Power
28500 W
ClassAB;RFLinearAmplifier;HighOperatingPoint

Characteristic

Grid-Screen Amplification Factor
4.5

Capacitance

Input Capacitance
160 pF
GroundedCathode
Output Capacitance
24.5 pF
GroundedCathode
Feedback Capacitance
1.5 pF
GroundedCathode
Input Capacitance
67 pF
GroundedGridAndScreen
Output Capacitance
25.5 pF
GroundedGridAndScreen
Feedback Capacitance
0.2 pF
GroundedGridAndScreen