The LZ319 is from the era of VHF television in the 1950s and early 1960s. The valve is a triode pentode designed to function as a mixer and local oscillator in the tuner.

The thin glass tube envelope is 20 mm in diameter and 47 mm tall, excluding the B9A base pins.

References: Datasheet. Type LZ319 was first introduced^¶ in 1954.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	a(t)	g1	g2	h	h	a	k,s,g3	k(t)	g1(t)

 
Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	9	0.3	170	170	-5.5	10.0	2.0	0.87M	2.1

Triode	Va	Vg	mAa
	100	-2	14

Thanks to Frank Philipse for supplying the above PDF datasheet