12SG7 @ The Valve Museum

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12SG7

Sensibly equivalent^¶ to:

CV694 VT-209

See also:

Metal Striptease

Extras ▼

Ken-Rad G8LSD Valve Collection Other 12SG7 exhibits

The 12SG7 is a 12.6 Volt version of the 6SG7 semi-vari mu pentode. The pins are compatible and the ratings are the same.

The envelope is also marked with the American Government code of VT-209.

The 12SG7 is a variable μ design with a medium gain. It was obsolete by the early 1960s.

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

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type 12SG7 was first introduced in 1940. See also 1940 adverts.

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	ra	gm
	12.6	0.15	250	150	-2.5	9.2	1M	4

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated November 28, 2013.

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