The PCL800 is a television receiver valve with a 300 mA heater for use with series heater chains. Domestic televisions worked at mains voltage and did not have a mains transformer.

It is a triode output pentode designed for field timebase or audio service.

The box that this exhibit came in was marked with a price of #1.26 plus purchase tax.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 69 mm tall.

References: Datasheet & ¹⁰⁴⁰. Type PCL800 was first introduced^¶ in 1960.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	g1(t)	k,bp,s	g1	h	h	a	g2	k(t)	a(t)

 
Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	μ
	6.3	0.3			-1

Thanks to Frank Philipse for supplying the above PDF datasheet