bon, j'ai trouvé quelques infos sur le net concernant les copies de Mullard, et il semble que Svetlana soit le plus proche de la réalité:
EL34s
Introduced by Britain's Mullard company in the early '50s, the EL34 was designed to be a powerful yet inexpensive tube for audio amplifiers. Capable of 40 watts, the EL34 could run circles around a 6L6, and its tall, thin glass envelope consumed minimal chassis space. The 34's low cost and high performance made it the obvious choice for British guitar amp companies such as Marshall, Hiwatt, Orange and Sound City.
These classic EL34s are rich, sweet and complex, with a nice midrange furriness that gets fatter and ballsier as you crank them up. Mullards are scarce and expensive these days but they are the ultimate for British amps.
The Reflector-made Groove Tubes GT-EL34R ($50/pair) is a good general-purpose tube that will do the job without busting your wallet. Its rather thin top end and lack of midrange complexity keep it out of the Mullard league, but it rocks well in most amps. More happening are Groove Tubes' GT-E34LS ($50/pair; $60 for blue or red glass). These balanced and bright-toned Slovakian made 34s sound richer and more musical than the 34Rs. They're a big improvement over previous El34 offerings, and should satisfy all but hard-core Mullard fans. (This tube is also available from Magic Parts as the E34LCZ at $48/pair) If maximum raunch is your request, (Groove Tubes' GT-El34C ($50/pair) is one of the softest and easiest-to-distort 34s we've heard. This Chinese tube will help tame-some might sap neuter--your non-master Marshall.
The Chinese-made Ruby EL34A-STR ($43/pair from Magic Parts) is a loud tube with punchy mids and bright highs. Not as complex as a Mullard, but we enjoyed its extra helping of clean headroom. Mojo Musical Supply's Siemens EL34 ($90/pair) sounded sweet, balanced and musical. These East German NOS tubes pack surprisingly rich mids and a crisp but not icepicky top. Though not quite as furry as the mullards, the Siemens come satisfyingly close. Siemens tubes are getting scarcer by the minute, so gets yours soon. Mojo's EI EL34 ($40/pair) is a soft-sounding Yugoslavian tube with chimey highs and a sweet, slightly nasal midrange. The Sovtek EL34WXT ($32/pair) combines good top-to-bottom balance with a roughness that'll endear it to hard rockers. WXTs are a good score when cost is everything, but watch out for crooked glass.
The big surprise was the Svetlana EL34 ($50/pair), a smooth-sounding bottle with silky highs and a rich, musical midrange. Its designers must have used Siemens and Mullard tubes for reference, because the Svetlana's classic tone borrows from both without precisely replicating either. To our ears, the best-sounding EL34 of the group, was Svetlana's Gold top EL34 ($54/pair). Super rich with brilliant spank, these girthy and roust-sounding tubes came the closest to cloning Mullard's magic. Svetlana informs us the Gold tops are more carefully matched, but other than that, their ELs are physically identical.
intéressant non?
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