The PCF80 is from the era of VHF television in the 1950s and early 1960s. The valve is a triode pentode, with separate cathodes, designed to function as a mixer and oscillator in the tuner.

See also PCC84 for the corresponding pre-amplifier valve for Band III television tuners from the mid 1950s.

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

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	at	g1	g2	h	h	ap	kp,s,g3	kt	gt

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	9	0.3	170	170	-5.5	5.2	1.5	0.87M	2.1

Triode	Va	Vg	mAa
	100	-2	14

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 10 June 2007 {find valves by name}