The W30 is a series two catkin from 1934 and is a 300 mA version of the VMP4. Theinternal 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.

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

 
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 datasheet

This exhibit was last updated on 02 December 2007 {find valves by name}