Tung-Sol is a brand owned by the American New Sensor Corporation and manufactured at the Xpo-Pul - Reflektor factory in Saratov, Russia. The Tung-Sol 6L6GC STR beam power tetrode tube is the ultimate in musical tone and smooth overdrive, delivering the classic sound that has defined Tung-Sol as the benchmark quality tube. "STR" indicates this tube is produced to the same "Special Tube Request" specs of the leading 1960 amp manufacturers. Rugged and reliable, it is a high quality option for use in the most demanding vintage and modern guitar amplifier circuits. It is rated for up to 500V plate voltage.
Open Datasheet - 6L6GC STR