MH4 @ The Valve Museum

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MH4

Sensibly equivalent^¶ to:

41MTL AC/HL AR17 CV399 CV1037 D4 HL4 MH4K NR31 VR37

See also:

Catkin Valves - The Metal Valve - New Catkin Valves - Osram Catkin Advert - CV1037 short entry - CV399 short entry - Osram Catkin Brochure - Osram HL2, HL210, H210, MH4 & DH Advert - Quality Amplifiers - Marconi Catkin Range Advert - Marconi Catkin Advert - Adding AVC to the Monodial Super - Osram Catkin Advert

Extras ▼

M-OV Valves Donated by Val Dawe Other MH4 exhibits

This MH4 catkin does not have the K suffix to denote the external anode design but is identical to the designation MH4K.

The MH4 was designated as being for detector service in radio receivers. Catkin versions of the 1929 MH4 were introduced in 1933 and 1934.

The Osram identification label.

The top of the outer screen is capped with a plastic disc. The external anode lies just under this plastic disc.

The outer metal shroud is 32 mm in diameter, and excluding the B5 base pins is 97 mm tall.

References: Data-sheet, ¹⁰⁰⁵, ¹⁰⁴³, ³⁰⁰² & ¹⁰⁴⁰. Type MH4 was first introduced in 1929. See also 1929 adverts.

Pin Connections

B5	1	2	3	4	5
	a	g1	h	h	k

Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	4.0	1.0	250	-4	5.0	11,100	3.6

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated October 02, 2022.

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