That is interesting as most advice you get on forums is Planar’s and tubes don’t mix 
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For the most part they typically don’t, until you get into the real higher end side of things
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Favourites for tube listening are AKG 712pro and Fostex T60. On the AKGs the already large soundstage becomes truly massive with fantastic imaging. The Fostex really applies the tube effect to guitars, if you’re into distorted electric guitar then you should hear this headphone on tubes.
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In addition to those already mentioned I find the T50 & T60 Argon’s respond well as do my Grado RS1’s to tube amps.
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