The type Z66 was MOV's late-1930s in-house attempt to make a small, modern high-slope pentode for wide-bandwidth IF systems in TV and radar, where bandwidths of several MHz were required.

A 'pinch' construction was used in order to ensure that the valve would be cheap and easy to make on existing production line machinery. The result was that the Z66 was very much a 'second best when it came to performance, particularly in terms of gain-bandwidth product and high-frequency noise figure. The radar receiving valve that won the War was the pinchless EF50 not the Z77, even though they had comparable data-book characteristics.

See Also Z66.

The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 78 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8	tc
	-	h	a	g2	-	-	h	k	g1

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.63	250	250	-1.85	8	2	1.5M	7.5

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This exhibit was last updated on 04 August 2006