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VMS4B

High-conductance variable-mu screen-grid valve for RF and IF amplification, emphasizing linear gain control, low grid-anode capacitance, and reduced cross-modulation distortion.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B5
Base pins: 5
Nominal heater: 4 V / 1 A

Description

A variable-mu screen-grid H.F./I.F. valve emphasizing high grid-voltage-to-mutual-conductance ratio, linearity, low grid-anode capacitance and high maximum conductance.

Socket description

European 5-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B5
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

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0029 S
Max plate voltage: 250 V
Max screen voltage: 80 V

Published ratings/characteristics promoted from approved source.

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

Tetrode

Other

Heater Voltage
4 V
Published datasheet value
Heater Current
1 A
Published datasheet value
Anode Voltage Maximum
250 V
Published datasheet value
Screen Voltage Maximum
80 V
Published datasheet value

Characteristic

Mutual Conductance
2900 µS
Published datasheet value