The recent Vacuum Tube Valley magazine compared several KT88 and 6550 tubes. The top tube was a KT88, but the 6550s were very close.
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I tried Sovtek KT88 in several amps, and did not like the sound of that tube, period. The Svetlana KT88 sounds far better, and the EH KT88 is very good also, though not as romantic as the Svetlana. I believe the Vacuum Tube Valley KT88 shootout is about 2 years old. The JJ-Telsa KT88 was one of their top tube choices. It's a great tube & very powerful, but it was a little analytical in my VT100, which needs the warming up of the Svet KT-88.