Have not used em but heard they are rugged and maybe little bright to some people (I never know how much to put into such reports). My understanding is that most Ei's (Yugo/Serbian)floating around now are not actually EL34's but a true beam tetrode and more rugged. Ei made a EL34 but this tube is not it. Sound dif. Many of the 6CA7s were relabled by the distributor (Orion?)Think I read about it at Jim's Citation Amp and Vacuum Tube Page. Try there for more info, check it out before you buy.
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