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Voltage Regulator ·VoltageRegulator

313A

Western Electric double-gap cold-cathode gas-filled tube for relay, rectifier, and voltage-regulator functions, combining heaterless switching, control, and rectifying behavior.

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

Description

Double-gap cold-cathode gas-filled relay, rectifier, and voltage-regulator tube.

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

Voltage Regulator

X-ray radiationInterelectrode capacitances
Max cathode current
30 mA
Regulator starting voltage
70 V
Regulator maintaining voltage
60 V

Promoted fields audited from printed ratings/characteristics; remaining published values preserved 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

2026 Western Electric 300s

Published operating points and test conditions from this source.

SECTION 1

Voltage Regulator

Other

  • Maximum peak control-electrode current

    30 milliamperes

    Maximum peak control-electrode current 30 milliamperes

  • Maximum peak reverse current in main gap

    5 milliamperes

    Maximum peak reverse current in main gap 5 milliamperes

  • Transfer current

    5 microamperes

    Transfer current 5 microamperes (max.)

Characteristic

  • Nominal control gap breakdown voltage

    70 volt

    Nominal control gap breakdown voltage 70 volts

  • Nominal control gap sustaining voltage

    60 volt

    Nominal control gap sustaining voltage 60 volts

  • Nominal main gap breakdown voltage

    175 volt

    Nominal main gap breakdown voltage 175 volts

  • Nominal main gap sustaining voltage

    75 volt

    Nominal main gap sustaining voltage 75 volts

  • rectifier. The current voltage characteristics of the main gap of a typical

    313 volt

    rectifier. The current voltage characteristics of the main gap of a typical 313A tube in both forward

  • a

    60 volt

    a 60 cycle sine wave main gap voltage if the load is inductive or if the peak voltage is near the

  • the control gap and on the main gap voltage. For a control gap current of

    10 volt

    the control gap and on the main gap voltage. For a control gap current of 10 microamperes the

  • Circuit A shows a circuit using the control gap of the

    313 volt

    Circuit A shows a circuit using the control gap of the 313A as a voltage regulator.

  • Circuit B shows a circuit using the

    313 volt

    Circuit B shows a circuit using the 313A as a relay. The anode voltage should be intermediate

  • the main gap breakdown voltage. It is important to note that as a rectifier the

    313 volt

    the main gap breakdown voltage. It is important to note that as a rectifier the 313A tube possesses