The PCF200 was designed as a frequency changer. The triode section forms the local oscillator and the pentode is used as the mixer. For VHF and UHF the pentode made a better mixer than the hexode. This was probably made in the mid 1960s when UHF television was just starting in the UK.

The thin glass tube envelope is 20 mm in diameter and, excluding the B10B base pins, is 46 mm tall.

 
Pin Connections

B10B	1	2	3	4	5	6	7	8	9	10
	k(t)	k(p)	g1	g3,s	h	h	a(p)	g2	a(t)	g1(t)

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm
	8.0	0.3	160	135	-1.7	13.0	5.3	14.0

Triode	Va	Vg	mAa	gm
	170	-1	8.5	5.2

Thanks to Frank Philipse for supplying the above datasheet

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