The type 6SG7 was designed for wideband RF and IF amplification and has a relatively high gm value to ensure a good gain-bandwidth product. It has dual cathode lead-outs to minimise the risk of self-oscillation due to parasitic coupling between input and output circuits caused by common impedance in series with the cathode.

The 6SG7 and 6SH7 are essentially similar except for grid pitch. Type 6SH7 is a 'straight' pentode while type 6SG7 has a variable-pitch grid, giving it a vari-mu characteristic, and would be suitable for the IF strip of radar receivers incorporating 'swept gain'.

The thin metal tube envelope is 25 mm in diameter and, excluding the IO base pins, is 50  mm tall.

 
Pin Connections

IO	1	2	3	4	5	6	7	8
	m	h	k	g1	k	g2	h	a

 
Absolute Maximum Operating Conditions

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	250	150	-2.5	9.2	3.4	1M	4

Thanks to Frank Philipse for supplying the above datasheet

This exhibit was last updated on 10 June 2007 {find valves by name}