VMS4 @ The Valve Museum

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VMS4

Sensibly equivalent^¶ to:

AC/SGVM AS4125 CV1165 MVS-Pen VP4

See also:

Some Important British Valves - M-OV's Screened Grid Valves - Osram MS4B, VMS4, MH4, MPT4 & U12 Advert - Variable-mu Valves - Adding AVC to the Monodial Super - The New Monodial Super

Extras ▼

Osram TNMoC The National Museum of Computing - Valves Other VMS4 exhibits

The VMS4 variable μ screened tetrode dates from 1931. It was designed for RF and IF amplification in broadcast superhet receivers.

This M-OV valve is badged as Osram suggesting it was made for domestic use.

The narrow tube before the flare would allow for a horizontal mounting with a chassis screen in just the same was as the original S625. Our other examples of the glass VMS4 and VMS4 lack this feature. We also have the 1933 Catkin version VMS4.

This is an early example with the screw down top connection. Later production used the top hat top cap.

The Osram brand.

The balloon envelope is 45 mm in diameter and, excluding the B5 base pins, is 122 mm tall.

References: Data-sheet & ¹⁰⁰⁵ Type VMS4 was first introduced in 1931. See also 1931 adverts.

Pin Connections

B5	1	2	3	4	5	tc
	g2	g1	h	h	k	a

Absolute Maximum Operating Conditions^¶

Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	4.0	1.0	200	80	0.0	14.0	3.0	0.45M	2.4

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated September 16, 2022.

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