Great question! I don't have them (yet) but I've read so many reviews and many recommend tubes with Klipsch. Since they don't require a lot of power, the First Watt should be just fine.
They respond well to quality but aren’t too picky about tubes vs solid state so far in my experience. Today listening to them with a Primaluna Dialogue Premium with great results but I also use an Almarro a205a and a Luxman 507ux. All sound great but you can hear the differences in the amps easily enough.
I'm not sure how much of the 12wpc (up to 17wpc depending on power tubes) Dennis Had Firebottle HO SEP is using to drive the Heresy IIIs, but there's a lot of headroom left in the thing...Since switching to Heresy IIIs a few years ago I've noted you can use ANY amp since they're amazingly efficient. The single ended tube amp has benefits of harmonically proper tone and simplicity not provided by other amp types, and I like it.
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