The MESA 5881 STR 425 is a Russian military grade 6L6 that was designed with an emphasis on rugged durability and consistency, capable of handling high voltage requirements. Produces a dark, rich tone with tapered highs that lends itself to styles of jazz, fusion, and blues or any style where tapered highs and a full round tone are needed.
Substitute in: Any 6L6 loaded MESA amp
Country of Origin: Russia
