MS/Pen @ The Valve Museum

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MS/Pen

Sensibly equivalent^¶ to:

8A1 A50A AC/S1Pen ARP23 CV1124 CV1282 MSP4 NR70 SC/SG SP4 SPT4A VR124

See also:

The Cathode-ray Oscillograph

Extras ▼

Chelmer Valve Donation from Jeremy Harmer

The MS/Pen is an indirectly heated straight HF pentode. See MVS-Pen for the vari-μ version. Both valves have the same distinctive Cossor envelope shape.

This valve is branded Chelmer Valve - a reseller established in 2002.

The classic envelope is 44 mm in diameter and, excluding the B5 base pins, is 113 mm tall.

Reference: Data-sheet & ¹⁰⁴³. Type MS/Pen was first introduced in 1933. See also 1933 adverts.

Pin Connections

B5	1	2	3	4	5	tc
	g2	g1	h	h	k,g3	a

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm
	4.0	1.0	200	100	-1.5	4.7	1.3	3.5

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated April 16, 2023.

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