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GU8

Marconi directly heated mercury-vapor half-wave power rectifier for higher-voltage service, providing approximately 22 kV inverse-voltage capability and 4 A average output.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 2.35 V / 40 A

Description

The Marconi GU8 is a directly heated half-wave mercury-vapor power rectifier for higher-voltage service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 2.35 V
Nominal heater current: 40 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

1 physical section, each with unique specifications.

Section 1

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 22000 V
Rectifier nominal output current: 4 A
Rectifier peak forward current: 16 A
Rectifier warm-up time: 1800 s

Mercury-vapor rectifier; highest published rectifier ratings promoted.

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Filament voltage
2.35 V
Filament current
40 A
Peak inverse voltage
22000 V
Peak cathode/anode current
16 A
Average cathode current
4 A
Minimum seasoning/preheat time
1800 s
Single-phase full-wave output voltage
14 kV
Single-phase full-wave output current
8 A
Three-phase full-wave output voltage
20 kV
Three-phase full-wave output current
12 A

Construction

Filling
Mercury vapor