Generally speaking KT88s have a "fatter" mid range and do not have quite the freq. extention of the 6550. It is really almost impossible say to which is best there are way to many variables. I plan to keep 6550s in my SLI-80 but there must be good reasons people are spending $400 + apiece for NOS MO KT88s. Why not try the Svet Kt88 and see what you think they are only around $200 a quad. Keep in mind that changing the preamp tubes in the SLI-80 will give you more bang for the buck.
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