The 9001 miniature valve is a sharp cut-off UHF pentode.

The high frequency of operation is possible without a co-axial construction mainly due to the very small size of the electrode system.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 37 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	g1	k	h	h	a	g2	k,s,g3

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.15	250	100	-3	2.0	0.7	1.0M	0.5

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 02 February 2008 {find valves by name}