I am the original owner and would describe the usage as light. many years left on the tubes.Great sounding kit here. Lots of good stuff on the web regarding this unit. I can't think of a better deal in all of audio, considering what you are getting. Not to mention the saved cost in less power cords and interconnects. Read what Lynn Olson has to say about this unit at positive feedback. Lynn has some of the best ears in the business and rarely likes anything. http://www.positive-feedback.com/Issue25/monarchy_m24.htm http://www.theabsolutesound.com/articles/monarchy-audio-nm24-dac-preamplifier/ http://www.highfidelityreview.com/monarchy-nm24-dac.html http://stereotimes.com/acc071806.shtml
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