4CV75000A

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: 10 V / 300 A

Description

Ceramic/metal vapor-cooled power tetrode for 50–80 kW output service, recommended for Class-C RF, Class-AB RF linear, and push-pull AF amplifier/modulator 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: 10 V
Nominal heater current: 300 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: 16000 V
Max screen voltage: 2500 V
Max plate dissipation: 75000 W
Max screen dissipation: 1750 W
Max grid dissipation: 500 W
Max cathode current: 12 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
300 A
At 10.0 V nominal
Frequency for Maximum Ratings
30 MHz
Maximum Plate Voltage
16000 V
Highest published applicable absolute maximum
Maximum Screen Voltage
2500 V
Highest published applicable absolute maximum
Maximum Plate Dissipation
75000 W
Maximum Screen Dissipation
1750 W
Maximum Grid Dissipation
500 W
Maximum DC Plate Current
15 A
Plate Voltage
15000 V
ClassAB;RFLinearAmplifier;HighOperatingPoint
Screen Voltage
1500 V
ClassAB;RFLinearAmplifier
Plate Output Power
82500 W
ClassAB;RFLinearAmplifier;HighOperatingPoint

Characteristic

Grid-Screen Amplification Factor
4.5

Capacitance

Input Capacitance
440 pF
GroundedFilament
Output Capacitance
55 pF
GroundedFilament
Feedback Capacitance
2.3 pF
GroundedFilament
Input Capacitance
175 pF
GroundedGrid
Output Capacitance
57 pF
GroundedGrid
Feedback Capacitance
0.4 pF
GroundedGrid

Data set 02

1965 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Heater/Filament Voltage
10 V
Heater/Filament Current
300 A
Amplification Factor
4.5

Other

Maximum DC Plate Voltage
15000 V
Maximum DC Screen Voltage
2500 V
Maximum Plate/Cathode Current
12 A
Maximum Plate Dissipation
75000 W
Maximum Screen Dissipation
1750 W
Maximum Grid Dissipation
500 W
Frequency for Maximum Ratings
30 MHz
Typical Plate Output Power
55 W

Construction

Cooling
Vapor and forced air