W30 @ The Valve Museum

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W30

Sensibly equivalent^¶ to:

VPTS W31

See also:

Catkin Valves - The Metal Valve - Osram W30 Box

Extras ▼

M-OV G8LSD Valve Collection

The W30 is a series two catkin from 1934 and is a 300 mA version of the VMP4. The internal envelope shape is similar to the N30 but the W30 has a substantial outer screening can rigidly attached.

The valve is a variable μ pentode and was used for broadcast radio reception. The 300 mA heater specification was introduced for series heater chains and, therefore, transformerless designs for 'Universal' AC/DC mains sets.

W31 is pin compatible but has a slightly lower specification.

The Osram Catkin label.

The wide metal tube envelope is 38 mm in diameter and, excluding the B7 base pins, is 114 mm tall.

References: Data-sheet & ¹⁰⁴⁰ Type W30 was first introduced in 1934. See also 1934 adverts.

Pin Connections

B7	1	2	3	4	5	6	7	tc
	m	g1	g3	h	h	k	g2	a

Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	13.0	0.3	250	250	-1	12	6	1M	4

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated December17, 2011.

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