MX40

Osram heptode frequency changer for superheterodyne radio receivers. Its multi-grid construction combines oscillator and mixer action, translating the selected radio-frequency signal to the receiver intermediate frequency.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B7
Base pins: 7
Nominal heater: 4 V / 1 A

Description

OSRAM MX40 frequency-changing valve for superheterodyne receiver service.

Socket description

Medium 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B7
Base pins: 7
Nominal heater voltage: 4 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

1 physical section, each with unique specifications.

Section 1

Heptode

X-ray radiationInterelectrode capacitances

Max plate voltage: 250 V
Max screen voltage: 100 V

Published ratings and characteristics promoted from the approved datasheet.

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

Heptode

Other

Heater/Filament Voltage
4 V
Published datasheet value
Heater/Filament Current
1 A
Published datasheet value
Maximum Anode Voltage
250 V
Published datasheet value
Maximum Screen Voltage
100 V
Published datasheet value