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Specialized - Thyratron ·Thyratron

714

Mercury-vapor negative-control thyratron for grid-controlled rectifier service. Grid triggering initiates low-drop mercury-discharge conduction.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
3G
Socket code
IO
Base pins
4
Nominal heater
2.5 V / 5 A

Description

RCA 714/7021 is a directly heated gas-and-mercury-vapor negative-control thyratron intended for grid-controlled rectifier service, with 1250-V peak forward and inverse anode ratings and ampere-level current capability.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
3G
Socket code
IO
Base pins
4
Nominal heater voltage
2.5 V
Nominal heater current
5 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

3G - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1Pin 1—F — Filament

Transcribed directly from EIA chart; independent cross-check not yet performed.

Unverified

EIA Base Connections chart, page 127 (uploaded BaseCodeDataCharts_OCR), base 3G

PIN3Pin 3AG1 — Control Grid

Transcribed directly from EIA chart; independent cross-check not yet performed.

Unverified

EIA Base Connections chart, page 127 (uploaded BaseCodeDataCharts_OCR), base 3G

PIN4Pin 4—F — Filament

Transcribed directly from EIA chart; independent cross-check not yet performed.

Unverified

EIA Base Connections chart, page 127 (uploaded BaseCodeDataCharts_OCR), base 3G

CAP1Top capAP — Plate (Anode)

Transcribed directly from EIA chart; independent cross-check not yet performed.

Unverified

EIA Base Connections chart, page 127 (uploaded BaseCodeDataCharts_OCR), base 3G

Section ratings

1 physical section, each with unique specifications.

Section 1

Thyratron

X-ray radiationInterelectrode capacitances
Max plate voltage
1250 V
Max cathode current
3 A
Rectifier forward voltage drop
15 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

  • Filament voltage

    2.5 V

    Nominal

  • Filament current

    5 A

    Nominal

  • Maximum deionization time

    1000 us

  • Maximum critical grid current

    5 uA

  • Peak forward anode voltage

    1250 V

  • Peak inverse anode voltage

    1250 V

  • Peak negative grid voltage before conduction

    500 V

  • Peak negative grid voltage during conduction

    10 V

  • Peak anode/cathode current

    3 A

  • Average anode/cathode current

    1 A

  • Fault current

    50 A

    Short-duration fault rating

  • Ambient or condensed-mercury operating temperature range

    +40 to +80 condensed-mercury operating range C

Characteristic

  • Minimum heating time prior to tube conduction

    5 s

  • Ionization time

    10 us

    Approximate

  • Anode voltage drop

    15 V

Capacitance

  • Grid-to-anode capacitance

    2 pF

    Approximate