The MESA EL-34 STR 447 is Mesa's very best overall, premium grade NOS equivalent EL-34 and Mesa's tube of choice in the production of all MESA EL-34 powered models. It offers traditional EL-34 tone & feel urgent and aggressive and is an excellent choice for all styles of gain, especially classic rock, alternative rock & metal. This tube is true to it's British origins with tight, focused low end, crushing midrange crunch and crystal-like highs. It's one of Mesa's favorites for authentic Brit tones.

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 Mesa's 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 Mesa's amplifiers depends on it.