The PCC189 is a low impedance high gain double triode. The technical specification specifically states that it is built with frame grids. The valves are variable μ types for use at RF as AGC controlled devices. The low voltage high current suggests a low noise design, probably as the front end stages in a television tuner. The low anode voltage suggests both stages used as a cascode (series connected) amplifier.

See PCC88 for the single μ or straight version.

The triode sections appear as separate structures. The anode is significantly larger than is found in most double triodes. The size and the blackening of the anode all point to these being run at significant current.

The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins it measures 46 mm long.

 
Pin Connections

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

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	7.6	0.3	90	-1.4	15	2500	12.5

Thanks to Frank Philipse for supplying the above PDF datasheet

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This exhibit was last updated on 04 July 2009