Tube radiocommunication 2e guerre mondiale, contrats entre 1941 et 1944.
Pentode de coupure semi-distant pour récepteur radio.
Provenance Armée Française
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.
Type 12SG7 was first introduced in 1940.