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Specialized - Thyratron ·Thyratron

4G401A

Grid-controlled thyratron for switching and controlled-conduction service, with electrical characteristics and operating ratings documented by Standard Valves.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
B7D
Socket code
B7D
Base pins
-
Nominal heater
6.3 V / 2.6 A

Description

4G401A Thyratron. Technical characteristics, ratings, and operating information are provided in the approved Standard Valves datasheet.

Socket description

7-contact B7D physical base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
B7D
Socket code
B7D
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
2.6 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

B7D - 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 cathode current
8 A
Rectifier peak inverse voltage
1 V

Ratings and characteristics extracted from 4G401A.pdf.

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

  • Heater voltage

    6.3 v

  • Nominal curren

    2.6 A

  • Cathode heating time, minimum

    30 sec

  • Grid to anode

    0.1 pF

  • Inpu

    7 pF

  • Qutpu

    3.6 pF

  • Maximum peak forward voltage

    650 v

  • Maximum peak inverse voltage 1

    500 v

  • before conduction

    -200 v

  • Maximum peak cathode curren

    8 A

  • $1Maximum average cathode curren

    800 mA

  • Maximum fault cathode curren

    30 A

  • Maximum duration of fault cathode curren

    0.1 sec

  • 11Maximum average screen curren

    100 mA

  • {$1Maximum average control grid curren

    50 mA

  • B Vh

    63 V

Characteristic

  • ime, approx. "Re; 10000 %1,

    800 mA

  • Va125V : Vg

    -148 V

  • Rg, 1000Q : 1,

    800 mA

  • Critical grid WithV,

    460 V

  • current, max. I

    800 mA

  • Voltage drop, approximately

    10 v