Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Specialized - Switching Tube ·RelayControlSwitch

413B

Western Electric cold-cathode gas-discharge device for specialized switching and control. Gas ionization provides abrupt heaterless conduction useful for triggering and relay functions.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
UX4
Base pins
-
Nominal heater
-

Description

Two-electrode inert-gas-filled cold-cathode tube for message-register, switching, pulse-counting, and control circuits.

Socket description

Medium-shell UX 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
UX4
Base pins
-
Nominal heater voltage
-
Nominal heater current
-
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

RelayControlSwitch

X-ray radiationInterelectrode capacitances
Max cathode current
200 mA

Promoted fields mapped from printed maximum-rating and characteristic headings; additional published values preserved in parameter rows.

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

2026 Western Electric 400s

Published operating points and test conditions from this source.

SECTION 1

RelayControlSwitch

Characteristic

  • Forward or Inverse Average Cathode Current

    20 milliamperes

    Forward or Inverse Average Cathode Current . . . . . . 20 200 milliamperes

  • Averaging Time - - - T T T

    2 seconds

    Averaging Time - - - T T T 2 seconds

  • Ambient Temperature L

    -55 centigrade

    Ambient Temperature L1m1ts S L B T T B A B -55 to +85 centigrade

  • Anode Voliage Drop, Forward or Inverse + «+ +« . .« .« bb

    62 volts

    Anode Voliage Drop, Forward or Inverse + «+ +« . .« .« bb 62 75 volts

  • Deionization Time, Approximate. . . . . . . . . . -~

    2 milliseconds

    Deionization Time, Approximate. . . . . . . . . . -~ 2 - milliseconds