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Specialized - Thyratron ·Thyratron

5632

Xenon-filled three-electrode thyratron for relay, motor-control, and ignitor-firing service. Grid triggering controls substantial gas-discharge current.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
4CF
Socket code
B7G
Base pins
4
Nominal heater
2.5 V / 9 A

Description

Xenon-filled three-electrode thyratron for relay, motor-control, and ignitor-firing service.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
4CF
Socket code
B7G
Base pins
4
Nominal heater voltage
2.5 V
Nominal heater current
9 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

4CF - 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
350 V
Max cathode current
30 A

Published maximum ratings and device-specific characteristics are promoted where schema-compatible; remaining switching/gauge/regulator electrical data is retained in section 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

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Other

  • Heater or filament voltage

    2.5 V

    Section1

  • Heater or filament current

    8.5 A

    Section1

  • Peak forward voltage maximum

    800 V

    Thyratron

  • Peak inverse voltage maximum

    1250 V

    Thyratron

  • Peak anode current maximum

    30 A

    Thyratron

  • Average anode current maximum

    2.5 A

    Thyratron

  • Maximum grid voltage

    -300 V

    Thyratron

Characteristic

  • Filament heating time

    60 s

    Thyratron

  • Tube voltage drop

    10 V

    Thyratron

  • Ionization time

    10 µs

    Thyratron

  • Deionization time

    1000 µs

    Thyratron

Data set 02

1971 RCA HB3 Binder 2 of 7

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Other

  • Filament voltage

    2.5 V

    Nominal

  • Filament current

    9 A

    Nominal

  • Maximum deionization time

    1000 us

  • Maximum critical grid current

    10 uA

  • Maximum anode voltage drop at end of life

    14 V

  • Maximum commutation factor

    0.66 VA/us^2

  • Peak forward anode voltage

    900 V

  • Peak inverse anode voltage

    1250 V

  • Peak negative grid voltage before conduction

    100 V

  • Peak anode/cathode current

    30 A

  • Average anode/cathode current

    2.5 A

  • Fault current

    300 A

    Short-duration fault rating

  • Ambient or condensed-mercury operating temperature range

    -55 to +75 C

Characteristic

  • Minimum heating time prior to tube conduction

    30 s

  • Anode voltage drop at beginning of life

    10 V

  • Grid control ratio

    200

    Approximate; stated grid-resistor and DC conditions

Capacitance

  • Grid-to-anode capacitance

    2 pF

    Approximate

  • Grid-to-cathode capacitance

    14 pF

    Approximate