The EF80 internally screened pentode was a workhorse of the VHF TV receiver and was introduced in 1950. The Z152 is the same valve but made by another manufacturer.

The internal screen obscures the electrodes.

The thin glass tube envelope is 20 mm diameter and excluding the B9A base pins, is 58 mm tall.

 
Pin Connections

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

 
Absolute Maximum Operating Conditions

Pentode	Va	Vs	Vg	mAa	mAs	ra	gm
	170	170	-2	10	2.5	0.4M	7.4

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 07 June 2009