345A

Western Electric indirectly heated full-wave high-vacuum rectifier for power-supply service. Rated for approximately 1.375 kV peak inverse voltage and about 330 mA maximum average DC output from a 6.3 V heater.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: UY5
Base pins: 5
Nominal heater: 6.3 V / 1 A

Description

The Western Electric 345A is an indirectly heated full-wave high-vacuum rectifier with a 6.3 V, 1.0 A heater and approximately 330 mA maximum average output.

Socket description

Medium 5-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: UY5
Base pins: 5
Nominal heater voltage: 6.3 V
Nominal heater current: 1 A
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

2 physical sections, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 1375 V
Rectifier nominal output current: 330 mA
Rectifier max heater-cathode voltage: 500 V

Representative row for two identical diode sections; published maximum total rectified current is 100 mA.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 1375 V
Rectifier nominal output current: 330 mA
Rectifier max heater-cathode voltage: 500 V

Second physical rectifier section; electrical properties populated from the documented identical section.

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

1956 Western Electric Tubes

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Maximum Peak Inverse Anode Voltage
1375 V
Maximum Average Output Current
330 mA
FullWaveRectifier

SECTION 2

Rectifier

Other

Maximum Peak Inverse Anode Voltage
1375 V
Maximum Average Output Current
330 mA
FullWaveRectifier

Data set 02

2026 Western Electric 300s

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

RMS alternating voltage per plate maximum choke-input
400 V
ChokeInputFilter
RMS alternating voltage per plate maximum condenser-input
350 V
CapacitorInputFilter
Maximum total rectified current
100 mA
Maximum filter input capacitance
4 uF
CapacitorInputFilter

SECTION 2

Rectifier

Other

RMS alternating voltage per plate maximum choke-input
400 V
ChokeInputFilter
RMS alternating voltage per plate maximum condenser-input
350 V
CapacitorInputFilter
Maximum total rectified current
100 mA
Maximum filter input capacitance
4 uF
CapacitorInputFilter