The whole point of the 6L7 is to ensure maximum isolation between oscillator and signal, and to provide a mixer which is efficient at VHF where stable oscillation would require a separate VHF oscillator triode. For applications where a self-oscillating mixer (ie. pentagrid converter) could provide adequate performance there were other Octal types specifically designed for this purpose.

The valve has its own screening with an internal metalisation on the inside of the envelope.

The classic envelope is 36 mm in diameter and, excluding the IO base pins, is 96 mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8	tc
	m	h	a	g2,g4	g3	-	h	k	g1

 
Absolute Maximum Operating Conditions

Heptode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	250	150	-6	3.3	8.3	1M	0.35

Thanks to Frank Philipse for supplying the above datasheet

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