The 6GW8 was one of the last audio triode output pentode valves designed. Uses were in domestic radio and audio equipment. Normally in single ended output stages for radiograms and tape recorders. The design proved popular in low cost stereo systems and was made by several companies, this exhibit being made by Westinghouse, an American company.

Copper grid supports are used for better heat dissipation.

The triode section in the foreground with the larger pentode behind.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 69 mm tall.

 
Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	g1(t)	k(t)	g2	h	h	a	k,g3,s	g1	a(t)

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.7	250	-1.9	1.2	62k	1.6

Pentode	Va	Vs	Vg	mAa	mAs	ra	gm	Pout	D
	250	250	-7	36	6	48k	10	4W	10%

Thanks to Frank Philipse for supplying the above PDF datasheet

More

 

This exhibit was last updated on 04 July 2009