Tungsol Reissue 6L6GC Power Tube, Apex Matched Pair The ultimate in musical tone and smooth overdrive, the STR delivers the sound that established Tung-Sol as the benchmark of quality. Built to the same Special Tube Request specs of leading amplifier manufacturers of the 1960s, the 6L6GC STR is a rugged and reliable power tube for use in the most demanding guitar ampli?er circuits. Made in Saratov, Russia Apex Matched Pair