Get my Guitar found the latest prices on the Mesa/Boogie 6L6 GCSTR441 Duet Power Tubes.

The STR 441 is an exceptional vintage-voiced 6L6 with superb low end, neatly tucked mids and an exceptionally smooth, tapered top-end for a warmer, richer and sweeter tone. They help provide the Treble and Presence Controls with an extended usable range without adding unwanted, detached "buzz", "sizzle" or harshness. They're standard in the Mark V and Lone Star amplifiers.