If I remember a conversation from a few years ago with c-j management correctly, the input circuit of the ART amp family was redesigned along with more teflon inside. Also, I recall that the output transformers of the ART amps were special, of upgraded bandwidth. The LP275 output trannies were more substantial than the lesser LP models as more power allowed them to drive bigger iron, so to speak. They made special mention of the custom wound, broad spectrum output trannies in the ART amps.
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Wilson Yvette speakers, Conrad-Johnson ART88 pre, TEA1bc phono, and ART27A Amplifier, Marantz digital player, Rega Planar 10 turntable / Apheta 3 cartridge,Wireworld Gold and Platinum Eclipse IC and speaker, I AQ Hurricane, Tornado power cables, Shunyata Denali 2 conditioner, dCS Bartok DAC/Streamer
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