Zaikesman had a thread on this that you might look for; unfortunately, the KT88s I lent him did not bias properly in his amp and he hasn't been able to try them, but I now think they may have been worn out from too many years in my Jadis, which tend to eat up tubes. I may lend him some virtually unused Gold Lions to try. My experience with Jadis, rather than VTL, amplification is that the KT88s have most of the bass power of the 6550s but a much richer and harmonically correct midrange--the 6550s sound thinner and coarser, less refined in that area in comparison. Can't tell if this will hold true in the VTL circuit, nor can I vouch for the Electro Harmonix tubes (the Gold Lions are to die for, though, IMHO), but it does seem consistent with what you were told.
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