4CX1500B

High-power ceramic/metal transmitting tetrode designed for RF power amplification, linear amplification, oscillation, modulation, broadcast, or related high-power service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6 V / 9 A

Description

Ceramic/metal forced-air-cooled radial-beam tetrode designed for low intermodulation distortion and low grid interception in RF and audio linear-amplifier 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: 6 V
Nominal heater current: 9 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: 0.03 S
Max plate voltage: 3000 V
Max screen voltage: 400 V
Max plate dissipation: 1500 W
Max screen dissipation: 12 W
Max grid dissipation: 1 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
6 V
Maximum Plate Voltage
3000 V
Highest published applicable absolute maximum
Maximum Screen Voltage
400 V
Highest published applicable absolute maximum
Maximum Plate Dissipation
1500 W
Maximum Screen Dissipation
12 W
Maximum Grid Dissipation
1 W
Maximum DC Plate Current
900 mA
Heater Current
9 A to 11 A
At 6.0 V
Plate Voltage
2900 V
ClassAB;RFLinearAmplifier
Screen Voltage
225 V
ClassAB;RFLinearAmplifier
Plate Output Power
1100 W
ClassAB;RFLinearAmplifier

Characteristic

Transconductance
30000 uS
Heating Time
3 min

Capacitance

Input Capacitance
75 to 88 pF
GroundedCathode
Output Capacitance
10.8 to 12.8 pF
GroundedCathode
Feedback Capacitance
- to 0.03 pF
GroundedCathode
Input Capacitance
38 pF
GroundedGridAndScreen
Output Capacitance
12 pF
GroundedGridAndScreen
Feedback Capacitance
- to 0.005 pF
GroundedGridAndScreen