Autoll, having some experience with the Modwright tube output stage that utilizes the 5687 tube type used in the SWL 9.0 SE preamp and Modwright Sony 9000ES/999ES DVD players, I can say that rolling tubes in a Modwright player will change the flavor. For example, TungSol 5687 are very linear, accurate and extended top to bottom. They are Dan Wright's tube of choice as far as I can tell. However, Sylvania GB-5687 tubes add just a touch of warmth and soften some edginess in the upper mids, which I quite like.
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