The Tube 6L6GCM-STR Redbase Premium Selected Pair includes two fresh-and-matched 6L6GC-style power amp valves for electric guitar amps. These high-quality valves can generate anything from brutally forceful to fully sugar-coated sound, delivering the same super-clear lows and transparent trebles as the original, American-made NOS RCA 6L6GC valves. They also add ample headroom and enhanced dynamics to American tube guitar amplifiers and, since the highly specialised Tube Amp Doctor is based in Germany, you can rest assured that the valves were subjected to strict inspections before they were matched.