Made by Sylvania, this is a great replacement for the 6L6 and the 6L6GC. These new old stock tubes offer a significant improvement over Russian 5881s. These tubes are great for guitar players who want an affordable alternative to the American-made STR384/6L6GC. Be the first to explore the tonal possibilities these tubes have to offer at a great introductory price of $50/tube. Like all our power tubes these are available in matched sets.