3CX1000A7

Ceramic-metal industrial power triode designed for high-power RF amplifier, oscillator, or modulator service. Manufacturer data emphasize transmitting duty, substantial plate dissipation, and the cooling provisions required for continuous professional operation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5 V / 30.5 A

Description

The Eimac 3CX1000A7/3CX1000A7 is a ceramic-metal zero-bias power triode for class-AB2 linear RF service, push-pull audio amplification or modulation, and VHF television applications.

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: 30.5 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

Triode

X-ray radiationInterelectrode capacitances

Amplification factor: 200
Max plate voltage: 3500 V
Max plate dissipation: 1500 W
Max grid dissipation: 45 W
Max cathode current: 1 A

Highest applicable published ratings promoted; service-specific ratings and operating points are preserved in TUBE_SECTION_PARAMETER.

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

1975 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Amplification factor
200
Heater/filament voltage
5 V
Heater/filament current
30.5 A
Typical zero-bias plate current
300 mA
Eb=2500V

Other

Maximum plate voltage
3500 V
Maximum plate dissipation
1500 W
Maximum grid dissipation
45 W
Maximum cathode/plate current
1 A
Frequency for maximum ratings
220 MHz
Audio-service plate dissipation
1000 W
Audio
RF-service plate dissipation
1500 W
RF

Capacitance

Input/grid-filament capacitance
32 to 32 pF
Output/plate-filament capacitance
0.15 to 0.15 pF
Feedback/grid-plate capacitance
14 to 14 pF

Construction

Cooling
Forced air

Data set 02

1976 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Amplification factor
200
Heater/filament voltage
5 V
Heater/filament current
30.5 A
Typical zero-bias plate current
300 mA
Eb=2500V

Other

Maximum plate voltage
3500 V
Maximum plate dissipation
1500 W
Maximum grid dissipation
45 W
Maximum cathode/plate current
1 A
Frequency for maximum ratings
220 MHz
Audio-service plate dissipation
1000 W
Audio
RF-service plate dissipation
1500 W
RF

Capacitance

Input/grid-filament capacitance
32 to 32 pF
Output/plate-filament capacitance
0.15 to 0.15 pF
Feedback/grid-plate capacitance
14 to 14 pF

Construction

Cooling
Forced air