RCA describe the 12CA5 as being designed for operation on a series heater string. The warm-up time for the AF output pentode is given as 11 seconds.

The thin glass tube envelope is 17 mm in diameter, and excluding the B7G base pins is 58 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	k,g3	g1	h	h	g1	g2	a

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm	Pdiss	Pout	D
	12.6	0.6	130	130	-1	32.0	-	16,000	8.1	5W	1.1W	5%

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 12 June 2007 {find valves by name}