I have had the Hyperions since they were first introduced in the US back in '94. I would agree tubes sound better with the 938s and Nordost would not be a good match. Get rid of the jumpers provided by the manufacturer and get good quality jumpers that are the same as your speaker wire - biwire if you can. Most silver cables sound brittle and thin to me. Copper has more body and natural timbre albeit with less ambience retrieval and imaging. Put Isonodes under the midrange/tweeter module - the best tweek I've found so far. There is an independent Hyperion users group website that you may find useful.
http://www.audiocircle.com/circles/index.php?board=80.0
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http://www.audiocircle.com/circles/index.php?board=80.0
Dear moderator, if I am violating any rules by posting the above link, please delete the link.