The MESA® 6L6 STR 440 is our very best overall, premium grade, USA equivalent 6L6, 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. Leading structural quality provides exceptional consistency and reliability and is an outstanding choice for ANY 6L6 based amps and all styles of music. The STR 440 is a direct replacement for our out-of-production STR 420s and STR 430s.

MESA power tubes are among the highest quality available and selected for their exceptional full-range tonal quality, consistency and reliability. All MESA tubes offer unsurpassed consistency and reliability for ANY tube amplifier, and certainly MESA amplifiers!

Remember… our dedication is to create the world’s finest tube amplifiers. And to achieve that goal requires a deeper commitment to tube quality… because the reputation of our amplifiers depends on it.