4CV20000A

Eimac vapor-cooled ceramic-metal power tetrode designed for oscillator, modulator, and amplifier service in both audio and radio-frequency applications.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 7.5 V / 73 A

Description

The Eimac 4CV20,000A is a vapor-cooled ceramic-metal power tetrode designed for oscillator, modulator, and amplifier use in audio and radio-frequency 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: 7.5 V
Nominal heater current: 73 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: 7500 V
Max screen voltage: 1500 V
Max plate dissipation: 20000 W
Max screen dissipation: 250 W
Max grid dissipation: 75 W
Max cathode current: 8 A

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

Characteristic

Frequency for Maximum Ratings
30 MHz
Filament/Heater Current
73 A to 78 A

Capacitance

Input Capacitance
108-122 pF
Grounded cathode
Output Capacitance
18-23 pF
Grounded cathode
Feedback Capacitance
1 pF
Grounded cathode
Input Capacitance
48-58 pF
Grounded grid
Output Capacitance
18-23 pF
Grounded grid

Data set 02

1965 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Heater/Filament Voltage
7.5 V
Heater/Filament Current
73 A
Amplification Factor
4.5

Other

Maximum DC Plate Voltage
7500 V
Maximum DC Screen Voltage
1500 V
Maximum Plate/Cathode Current
8 A
Maximum Plate Dissipation
20000 W
Maximum Screen Dissipation
250 W
Maximum Grid Dissipation
75 W
Frequency for Maximum Ratings
30 MHz
Typical Plate Output Power
33000 W

Construction

Cooling
Vapor and forced air