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372A

Western Electric inert-gas cold-cathode tube for rectifier, relay, voltage-regulator, triggering, counting, and switching circuits. Its multifunction control role is broader than ordinary thermionic power rectification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: UX4
Base pins: -
Nominal heater: -

Description

The 372A is a three-electrode inert-gas-filled cold-cathode tube for relay, voltage-regulator or rectifier circuits, especially triggering, counting and switching control apparatus.

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

Rectifier

X-ray radiationInterelectrode capacitances

Max plate voltage: 150 V
Max cathode current: 35 mA

Forward peak anode voltage 150 V; maximum average forward cathode current 35 mA.

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

Rectifier

Other

ForwardPeakAnodeVoltage
150 V
PeakForwardCathodeCurrent
100 mA
PeakInverseAnodeCurrent
2 mA

Characteristic

StarterBreakdownVoltage
70 V
Bogey; Min=62 V; Max=89 V
StarterVoltageDrop
60 V
20 mA; Bogey
Anode Voltage Drop
75 V
20 mA; Bogey
TransferCurrent
5 uA
130 V DC anode