The KT-88 has always been my favorite octal output tube, 6550s being too harsh and EL-34s being too soft at the frequency extremes. However I just re-tubed one of set of amps with Sovtek's new 6550WE (RAM-tested) and have been most impressed. They seem to have the magical midrange of the EL-34 but with much better frequency extension and much tighter bass. I was completely unaware of this tube until recently but to my ears the KT-88 has some serious competition. Anyone else have experience with this tube?
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