N30 @ The Valve Museum

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N30

Sensibly equivalent^¶ to:

7D5 PP13A

See also:

In the Beginning - Osram - Catkin Valves - The Metal Valve

Extras ▼

Osram The John Lawrence Collection Other N30 exhibits

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

It was designed to be used as the audio output stage of a Universal receiver for use with AC or DC mains. The design is dated to 1934 and is a series 2 Catkin. The N30 was a version of the MPT4 but with a 13 Volt 0.3 Amp heater for use in 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.

References: Data-sheet & ¹⁰⁰⁵. Type N30 was first introduced in 1934. See also 1934 adverts.

Pin Connections

B7	1	2	3	4	5	6	7
	nc	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 PDF datasheet.

Updated July 02, 2023.

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