The N30 is from the second series of MOV Catkins and has an opaque enamelled top envelope.

The N30 was a version of the MPT4 with a 13V 0.3A heater, intended for use in AC/DC sets.

The visible envelope is in fact a precision shaped copper anode that is sealed to the lower glass envelope.

The large wide base hides a rubber sealing ring that helped to reduce microphonic effects.

The thin metal tube envelope is 18 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 01 February 2008