359A

Cold-cathode relay and control tube using gas-discharge conduction. It provides heaterless electronic switching for control and signaling circuits.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

The 359A is a three-electrode inert-gas-filled cold-cathode tube primarily for relay service and also for triggering, counting, switching and visual-indicator 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 plate voltage: 165 V
Max cathode current: 15 mA

Forward peak anode voltage 165 V; maximum average forward cathode current 15 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

RelayControlSwitch

Other

ForwardPeakAnodeVoltage
165 V
InversePeakAnodeVoltage
165 V
PeakForwardCathodeCurrent
40 mA

Characteristic

StarterBreakdownVoltage
80 V
Bogey; Min=67 V; Max=89 V
StarterVoltageDrop
65 V
10 mA; Bogey
Anode Voltage Drop
80 V
10 mA; Bogey
RequiredTransferCurrent
50 uA
130 V anode
DeionizationTimeMainGap
1 ms
Bogey
IonizationTimeStarterGap
0.05 ms
Bogey