The impedance curve of that speakeris not all that flat and dips down just below 4 ohms in the midrange, which is not ideal for a tube amp, but they are above average in sensitivity @ 91 dB. The reviews say that the EAR can drive Wilson Watt Puppies that are 90 dB sensitivity. I'd say try it out and see. A lot will depend on how big your room is and how loud you like to listen.
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GIven that the Triton 3 is a scaled-down Triton 2, read the Stereophile review of the Triton 2, where reviewer Deutsch auditions the speakers with a SImaudio SS amp and two much lower-powered tube amps. Although the SS amp produced tighter bass, even with the Triton's built-in bass amps, the tube amps had more harmonic richness and tonal authenticity. In spite of its low price, the Tritons have the resolution to reward more harmonically rich amplification.
Also, according to the TAS review of the Triton 2's, Sandy Gross himself powers his with a low-powered SET amp:
According to the reviews I've read, the Triton 3s are probably one of the *best* candidates at that price range to get full-range sound out of your EAR 859.