This exhibit is clearly marked 32 on the envelope and is an American made valve. It was designed as an RF amplifier in battery operated receivers.

The classic envelope is 42 mm in diameter and, excluding the UX4 base pins, is 110 mm tall.

 
Pin Connections

UX4	1	2	3	4	tc
	f	a	g2	f	g1

 
Absolute Maximum Operating Conditions

Tetrode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	2.0	0.06	180	67.5	-3	1.7	0.4	1.2M	0.65

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 12 June 2007 {find valves by name}