The PCC88 is a television RF amplifier and was the original TV frame grid valve. It was very reliable in use. With the same heater requirements and base connections the PCC189 provided the variable μ version.

The PCC88 is a double triode with separate cathodes. The PCC85 has the same base connections.

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

References: Datasheet & ¹⁰⁴⁰. Type PCC88 was first introduced^¶ in 1957.

 
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
	7.0	0.3	90	-1.2	15	2,650	12.5

Thanks to Frank Philipse for supplying the above PDF datasheet