For the AR speakers I'm guessing the Hafler would be a better way to control and provide force than with a tube unit. My opinion would be to start with the CD player, if cd's and not vinyl are your source and try out different CD playters... 1k could get you a used Rega Saturn or other(s). I personally would explore very good cables, speaker and interconnect and power before plunking 1K down on an amp mod... also I happen to like AR's, I have a pair of AR 11's I'm playing right now but they are not super high resolution/detail/imaging/"space" champs like other more modern speakers and may not benefit from $1K mod. Just my 2cents.
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