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GU5

Indirectly heated OSRAM fluorescent visual tuning indicator for radio receivers, with display appearance varying according to the applied control signal.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B4
Base pins: -
Nominal heater: 4 V / 3 A

Description

GU5: OSRAM visual tuning indicator. The complete approved OSRAM sheet was read for construction, characteristics, operating data, and application guidance.

Socket description

European 4-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B4
Base pins: -
Nominal heater voltage: 4 V
Nominal heater current: 3 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

Tuning Indicator

X-ray radiationInterelectrode capacitances

Max plate voltage: 0 V

Published characteristics and maximum ratings promoted where applicable; additional operating data retained as parameters.

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

1937 Osram Valves

Published operating points and test conditions from this source.

SECTION 1

Tuning Indicator

Characteristics

Heater/filament voltage
4 V
Heater/filament current
3 A
Display function
Visual tuning indication

Other

Maximum anode voltage
0 V