The CV1091 is the service version of the EF50. It is clearly a utility valve with its plain aluminium screening can devoid of the familiar red point.

The valve is a high impedance pentode and was a workhorse of receivers for both radio and especially radar.

The wide glass tube envelope is 32 mm in diameter and, excluding the B9G base pins, is 57 mm tall.

 
Pin Connections

B9G	1	2	3	4	5	6	7	8	9
	h	g2	a	g3	s	k	g1	s	h

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	250	250	-2	10	3	1M	6.5

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This exhibit was last updated on 19 January 2003