The PCH200 is a television triode heptode. The triode was designed as a pulse amplifier and the heptode section was designed for service as a noise gated sync. separator in colour television receivers.

Seen side on, the anode closest to the camera is the small triode. The thin grid wirescan be seen together with the copper support rods. Behind the triode can be seen the grid supports of the heptode section.

The thin glass tube envelope is 20 mm in diameter, and excluding the B10B base pins is 48 mm tall.

 
Pin Connections

B10B	1	2	3	4	5	6	7	8	9	10
	k,g5,s	g3	g1	g2,g4	h	h	a	g1(t)	k(t)	a(t)

 
Absolute Maximum Operating Conditions

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs
	8.5	0.3	14.0	14	-1.8	0.02	-

Triode	Va	Vg	mAa	ra	gm	μ
	200	-	9.0	-	8.8	50

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 06 February 2008 {find valves by name}