Mactone amplifiers


Has anyone auditioned the Japanese Mactone amplifiers (esp. XM-IIA integrated powered with KT-88/6550 tubes)?
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I am currently using a Mactone XM-IIa with a Resolution Audio Opus 21 driving Merlin VSM-MX speakers. I replaced a Manley Stingray and the Mactone is in a different league. Smoother with more detail as well as bass punch. Highly recommended!