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Specialized - Thyratron ·Thyratron

672A

Mercury-vapor tetrode thyratron designed for high-voltage grid-controlled rectifier service, providing triggered conduction in substantial power-conversion equipment.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
IO
Base pins
-
Nominal heater
5 V / 5 A

Description

Mercury-vapor tetrode thyratron for high-voltage grid-controlled rectifier service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
IO
Base pins
-
Nominal heater voltage
5 V
Nominal heater current
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
Max plate voltage
2500 V
Max cathode current
40 A
Rectifier forward voltage drop
12 V

Thyratron section; peak/average current, inverse voltage, timing, and gas/mercury 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

1971 RCA HB3 Binder 2 of 7

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Other

  • Peak forward anode voltage

    2500 V

  • Peak inverse anode voltage

    2500 V

  • Peak cathode/anode current

    40 A

  • Average cathode/anode current

    3.2 A

  • Fault or surge current

    150 A

    ShortDuration

  • Ambient temperature range

    45 to 50 C recommended

  • Heater voltage

    5 V

  • Heater current

    5 A

  • Peak grid No.2 voltage

    -300 V

  • Peak grid No.1 voltage

    -1000 V

Characteristic

  • Ionization time

    10 us

    Approximate

  • Deionization time

    1000 us

    Approximate

  • Anode voltage drop

    12 V

    Conducting

  • Minimum heating time

    5 min

    BeforeConduction

Construction

  • Gas fill

    Mercury vapor

Capacitance

  • Grid-to-anode capacitance

    0.04 pF

    Approximate

  • Grid No.2-to-anode capacitance

    3 pF