TAD RT812 6L6WGC-STR Tube Duet - new version of the popular 6L6WGC-STR with beautiful brown base. Somewhat smoother trebles, tighter bass and more mid range. The 6L6WGC tube is very quiet and especially long lasting. The rugged mechanical construction as well as the extra heavy glass make this tube the first choice especially for combos (Fender, Boogie, Engl etc).