I actually had the mini monos for some time and found that Russian tubes in general were not the best in these amps. The Tesla E34L is very good as are JJ E34L. Saratov KT66 (I think Groove Tube packages these, two styles I've seen) was very nice but hard to find and not very duable (hot spots on plates). Sylvania 12ax7 are nice on the input.
KT88 recom. for quicksilver mini mono's
I recently aquired a set of mini's and am looking for sugestions on tubes. Of what I have tried so far I have found I like the sovtek 6L6's. Upscale recommended the EHkt88 for a clean,dry, less warm sound, since I think that is the direction I am going in. What would you guys recommend that you have tried, what would you not recommend? Thanks, Matt