I recently purchased a SD 135. The power cord is 14 awg 20 amp on the female end and it has a standard 15 amp male connector that goes to the wall or conditioner. No worries. Buy the Audio Research.
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It's probably just a matter of preferring the mechanically superior 20Amp IEC connector to the "industry standard" 15A inlet
Just because the appliance is fitted with a 20A inlet does not mean it cannot be plugged into a standard wall outlet - if fitted with a 15A connector on the male end of the power cord.
20Amp Cord Cap
Above a link to a 20A power cord connector
As Always Good Listening