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Power - Tetrode (NOT beam) (over 1000V 100W) ·Tetrode

4W20000A

Water-cooled high-power Eimac transmitting tetrode designed for RF power service, capable of tens of kilowatts output and operation into the VHF range.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
12 V / 80 A

Description

The EIMAC 4W20000A is a water-cooled high-power transmitting tetrode.

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
12 V
Nominal heater current
80 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
5.5
Max plate voltage
8000 V
Max screen voltage
1200 V
Max plate dissipation
20000 W
Max screen dissipation
250 W
Max grid dissipation
60 W
Max cathode current
6.6 A

Promoted from printed maximum-rating and general-characteristics tables.

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

  • Amplification factor

    5.5

Other

  • Maximum DC plate voltage

    8000 V

  • Maximum DC screen voltage

    1200 V

  • Maximum plate dissipation

    20000 W

  • Maximum screen dissipation

    250 W

  • Maximum grid dissipation

    100 W

  • Maximum cathode/plate current

    6.6 A

Data set 02

1965 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Frequency Maximum

    250 MHz

  • Typical TV Visual RF Output

    26000 W

  • Grid-Screen Amplification Factor

    4.5

  • Cathode Bombardment Voltage

    1500 V

  • Filament Current

    1.8 A

  • Water Cooling Required

    1 boolean