Sensibly equivalent¶ to:
The 12SN7GT is a small glass tubular audio double triode, the design dates to the 1940's. This was a classic valve with two separate triodes in the one envelope. This exhibit has been made by Philips in Holland and branded Mullard. The use of the American Type designation shows that this was the standard name for this valve.
The 6SN7 six volt version remains the most popular Octal based double triode valve for audio applications. The valve is especially well suited to phase splitter designs.
The reverse of the envelope is plain and the dark glass obscures the double triode construction.
The wide glass tube envelope is 30 mm in diameter, and excluding the IO base pins is 63 mm tall.
References: Data-sheet, 1040 & 1043. Type 12SN7GT was first introduced in 1940. See also 1940 adverts.
Absolute Maximum Operating Conditions¶
Updated October 16, 2014.