12AT7 @ The Valve Museum

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12AT7

Sensibly equivalent^¶ to:

6060 B152 B309 CV455 E2157 ECC81

See also:

Valves and their Habits - Pin Compatible Double Triodes - Mufax Chart Recorder Maintenance Manual - A reliable Process Timer

Extras ▼

Sylvania Donation by Crowthorne Tubes Other 12AT7 exhibits

The 12AT7 double triode is equivalent to the Mullard ECC81. This type of valve was designed for RF use and is of the low impedance type.

The Sylvania name and Made in USA.

The twin triode sections seen end on. There is no additional screening between the sections.

The thin glass tube envelope is 20 mm in diameter and excluding B9A base pins the length is 46 mm.

References: Data-sheet & ¹⁰⁴⁰. Type 12AT7 was first introduced in 1947. See also 1947 adverts.

Pin Connections

B9A	1	2	3	4	5	6	7	8	9
	a(2)	g1(2)	k(2)	h	h	a(1)	g1(1)	k(1)	hct

Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	6.3	0.3	250	2.0	10.0	10,000	5.5

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated March 12, 2022.

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