Unless you can individually bias each power tube, matched sets will improve the overall sound simply because the tubes will be drawing similar current.
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The amp has one rectifier 6CA4 tube and two 6SN7 tubes - one per channel. See the links for pictures. Thanks for the assistance.
That really depends entirely upon the circuit you'd be using them in. I'm not familiar with your amp - but I might suggest you ask the manufacturer. Matched power tubes in circuits that are individually biased, for instance, won't make any difference assuming the bias is accurate and identical. Matched tubes in a parallel SET circuit wouldn't make any difference. I think they become more important in preamp circuits, but I know too little to make my speculations dangerous. Someone with more grey matter between the ears can correct me here.
As an addendum to your question - I've always wondered this - When you purchase a set of matched tubes for a circuit that actually does take advantage of the fact that they are closely matched...as you play stereo music through them, which sometimes taxes each channel slightly differently, don't the tubes become gradually mismatched according to that uneven demand on them? If so, and you start out with matched tubes, how long before they are no longer very close?