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Voltage - Triode (single) ·Triode

MH4

High-magnification directly heated triode for detector and first low-frequency amplifier service; plate dissipation is about 2.5 watts.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B4
Base pins
5
Nominal heater
4 V / 1 A

Description

OSRAM MH4 triode for amplification, detection, or power-output service as specified in the supplied datasheet.

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
5
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

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
11400 Ω
Transconductance
0.0035 S
Amplification factor
40
Max plate voltage
250 V
Max plate dissipation
2.5 W

Promoted values mapped from printed rating/approximate-data tables; additional operating points and capacitances 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

192X Marconi Valve

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Published operating data

    See source

    Operating curves/table are present on the approved one-page source; values not promoted unless unambiguous in searchable text.

Data set 02

1937 Osram Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Optimum load resistance

    50000 ohm

    Published operating data

Data set 03

193X Osram

Published operating points and test conditions from this source.

SECTION 1

Triode

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 Anode Dissipation

    2.5 W

    Published datasheet value

Characteristics

  • Plate Resistance

    11100 ohm

    Published datasheet value

  • Mutual Conductance

    3600 µS

    Published datasheet value

  • Amplification Factor

    40

    Published datasheet value

Data set 04

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Approximate Plate Resistance

    11400 ohm

  • Approximate Amplification Factor

    40

  • Approximate Transconductance

    0.0035 A/V

  • Detector Anode Voltage Minimum

    50 V

  • Detector Anode Voltage Maximum

    150 V

  • LF Amplifier Anode Voltage Minimum

    150 V

  • LF Amplifier Anode Voltage Maximum

    200 V