The MESA 6L6 STR-440 is our very best overall 6L6 - It is a premium grade, US equivalent and our tube of choice in the production of all new Mesa 6L6 powered models - Remarkable bass definition, articulate mids and shimmering highs keep every note amazingly intelligible, with a smooth, creamy character - Premium structural quality provides exceptional consistency and reliability - Rivals NOS (New Old Stock) durability and sonic character - Amazing for all styles of music.

The STR 440 is a direct replacement for our out of production STR 420's and STR 430's.

We start with the finest tubes from around the world, test and match each one under simulated operating conditions to the tightest, most demanding industry spec. Then we back them with the best warranty in the business - a minimum of six months

Free 3-Year Warranty

In addition to the standard included manufacturer warranty, virtually all new products carry our exclusive, industry-leading, absolutely free Sound Pure 3-Year Warranty, which includes parts and labor. It's our way of adding real value to the personal touch our small, dedicated team brings to every purchase.

Coverage exclusions live in Terms & Conditions, Section 27. Read the warranty →