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

8974

High-power transmitting tetrode designed for RF power amplification, linear amplification, oscillation, modulation, or frequency multiplication.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
18.5 V / 650 A

Description

The EIMAC 8974 is a two-section-filament water-cooled ceramic/metal megawatt-class power 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
18.5 V
Nominal heater current
650 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
22500 V
Max screen voltage
2500 V
Max plate dissipation
1500000 W
Max screen dissipation
15000 W
Max grid dissipation
4000 W
Max cathode current
125 A

Promoted from printed general-characteristics and absolute-maximum-ratings blocks.

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

    4.5

Other

  • Maximum DC plate voltage

    22500 V

  • Maximum DC screen voltage

    2500 V

  • Maximum plate dissipation

    1500000 W

  • Maximum screen dissipation

    15000 W

  • Maximum grid dissipation

    4000 W

  • Maximum cathode/plate current

    125 A