Type CV1285 and its commercial equivalent the 6N7, is by no means a general-purpose double triode since it has a powerful heater, a common cathode, and is designed to operate in push-pull Class B2 with zero grid bias or quiescent push-pull. The anode to anode load is given as 8,000 Ohm.

It is specifically an audio power valve capable of 10W per pair.

The classic envelope is 42 mm in diameter and, excluding the IO base pins is 82 mm tall.

References: Datasheet & ¹⁰⁴³. Type CV1285 was first introduced^¶ in 1937.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	m	h	a(2)	g1(2)	g1(1)	a(1)	h	k

 
Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa
	6.3	0.8	300	0	35.0

Thanks to Frank Philipse for supplying the above PDF datasheet