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358A

Cold-cathode glow visual-signal tube rather than a conventional power rectifier. Its gas-discharge construction is intended to provide a visible indication or signaling function without a heater supply.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

The 358A is a two-electrode inert-gas-filled cold-cathode tube designed to provide a visual signal in telephone work; its glow appears near the negative electrode.

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 cathode current: 18 mA

Cold-cathode visual signal tube; 18 mA is the published maximum average cathode-current rating.

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

Maximum Peak Cathode Current
35 mA

Characteristic

Anode Breakdown Voltage
- to 85 V
Bogey
Anode Voltage Drop
- to 75 V
Bogey
LightOutput
0.6 lumen
15 mA DC