This N30 carries the Osram badge, it is a Catkin external anode audio output valve. All Catkins were made by MOV.

It was designed to be used as the audio output stage of an all-mains receiver. The design is dated to 1934 and is a series 2 Catkin. The N30 was a version of the MPT4 but with a 13V 0.3A heater for use in AC/DC sets without mains transformers.

The thin metal tube envelope is 18 mm in diameter, with the metal base 28 mm in diameter and, excluding the B7 base pins, is 103 mm tall.

 
Pin Connections

B7	1	2	3	4	5	6	7
	-	g1	g2	h	h	k	a

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm
	13.0	0.3	250	250	-15	32	8	3.9

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 02 February 2008 {find valves by name}