The 6K7 style of pentode was designed in the mid to late 1930s for intermediate frequency amplifiers in 'modern' superhet type receivers. It is high impedance allowing for a high Q in the tuned anode circuit.

See also the 6K7G full sized glass envelope version, and 6K7 original metal valve.

The wide glass tube envelope is 28 mm in diameter and excluding the IO base pins the valve is 70 mm long.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	m	h	a	g2	g3	nc	h	k

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	250	125	-3	10.5	2.6	0.6M	1.65

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 04 July 2007 {find valves by name}