4CX1500A

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: 5 V / 38.5 A

Description

General-purpose ceramic radial-beam tetrode for VHF, Class-C power amplification, Class-B/AB linear amplification, regulator, and pulse-modulator 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: 5 V
Nominal heater current: 38.5 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

Transconductance: 0.026 S
Amplification factor: 5.5
Max plate voltage: 5000 V
Max screen voltage: 750 V
Max plate dissipation: 1500 W
Max screen dissipation: 75 W
Max grid dissipation: 25 W

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
5 V
Heater/Filament Current
38.5 A
At 5.0 V nominal
Frequency for Maximum Ratings
150 MHz
Maximum Plate Voltage
5000 V
Highest published applicable absolute maximum
Maximum Screen Voltage
750 V
Highest published applicable absolute maximum
Maximum Plate Dissipation
1500 W
Maximum Screen Dissipation
75 W
Maximum Grid Dissipation
25 W
Maximum DC Plate Current
1 A
Plate Voltage
3900 V
ClassAB;RFLinearAmplifier
Screen Voltage
600 V
ClassAB;RFLinearAmplifier
Plate Output Power
1850 W
ClassAB;RFLinearAmplifier

Characteristic

Grid-Screen Amplification Factor
5.5
Transconductance
26000 uS

Capacitance

Input Capacitance
78 pF
GroundedCathode
Output Capacitance
10.5 pF
GroundedCathode
Feedback Capacitance
0.25 pF
GroundedCathode

Data set 02

199X Svetlana

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Maximum Plate Voltage
5000 V
Maximum Screen Voltage
750 V
Maximum Plate Dissipation
1500 W
Maximum Screen Dissipation
75 W