I remember seeing similar posts like this one on http://audioasylum.com. One person commented that he preferred the 6550's and another liked the KT88's. I also own a Premier 11a but haven't tried KT88's. If you plan to do a comparison it might be more fair to compare new KT88's against new 6550's (vs the old ones that are heading south). I would love to get your opinion if you do try the KT88's. I've had good experiences buying my tubes from http://TheTubeStore.com as well as from Upscale Audio.
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