Made in England this STC S11E12 vacuum tube #7971 is a special quality version of 12E1.

Output valve with the classic STC logo in bold letters.

Tube envelope is 38 mm in diameter and excluding base pins is 80 mm tall.

This beam tetrode was introduced in 1959 and was intended for use as a series or shunt control valve in stabilized power supply units.

Built with Special shock resistant construction giving increased reliability and life expectancy

Has original box.

Original box and valve will be shipped inside another box.