MU12

OSRAM full-wave rectifier for receiver power supplies. Its four-volt heater and moderate rectified output suit contemporary radio, amplifier, and related electronic equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B4
Base pins: 4
Nominal heater: 4 V / 2.5 A

Description

OSRAM MU12 full-wave rectifier for receiver power-supply service.

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: 4
Nominal heater voltage: 4 V
Nominal heater current: 2.5 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

Max plate voltage: 350 V
Rectifier nominal output current: 120 mA

Published ratings and characteristics promoted from the approved datasheet.

Section 2

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier nominal output current: 120 mA

Second physical rectifier section; promoted electrical properties populated from 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

193X Osram

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

Heater/Filament Voltage
4 V
Published datasheet value
Heater/Filament Current
2.5 A
Published datasheet value
Maximum RMS Anode Voltage Each Anode
350 V
Published datasheet value
Maximum Smoothed DC Output Current
120 mA
Published datasheet value