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3V490A

Mercury-vapor thyratron designed for industrial-control switching, using grid control to trigger high-current conduction in power-control and controlled-rectifier circuits.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: B4D
Base pins: -
Nominal heater: 5 V / 10.5 A

Description

Mercury-vapor industrial-control thyratron.

Socket description

Subminiature wire-ended

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B4D
Base pins: -
Nominal heater voltage: 5 V
Nominal heater current: 10.5 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

Thyratron

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Values transcribed from the approved datasheet; additional published data retained as parameters.

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

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Other

Anode to grid
0.1 pF
Published direct interelectrode capacitance
Grid to cathode
15 pF
Published direct interelectrode capacitance
Heater/filament nominal current
10.5 A
Nominal published value