MS4B @ The Valve Museum

▼ Menu

Home Search Indexes Equivalents Articles Adverts & Boxes Timeline Collections Donate Contact

MS4B

Sensibly equivalent^¶ to:

AC/S2 AC/SG AC/SH AS4120 CV3553 MS/Pen MSG/HA MSG/LA SGA1 SP4 SV4 SV4A SV4B

See also:

Marconi AC Valves Advert

Extras ▼

M-OV HMS Collingwood Other MS4B exhibits

The MS4B glass version was issued before the catkin version MS4B that was issued in 1933/4. The original MS4 dates to 1929.

The missing top cap connector was almost certainly of the black screw-on type.

It is a tetrode from the early mains valve era with its 4 Volt heater and it offered 'maximum amplification', whereas the earlier MS4 was a general purpose screened grid valve. The screened tetrodes and pentodes were employed for RF and IF amplification.

The balloon envelope is 43 mm in diameter and, excluding the B5 base pins, is 110 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type MS4B 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	-1	3.4	1.2	0.35M	3.2

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated November 13, 2021.

Return to Main Index