The LS16 Audio Research is the same guts as the LS25, only it's got less inputs....nothing more.(even according to the AR technicians. And,the LS16 is much cheaper used.(upgraded tubes are mandatory for better sound) What price range are you after?
Blue Circle preamps starting with the BC9 have balanced outputs and use tubes. I have never heard it, but as an awner ogf the BC3 (two levels "down") I aspire to it! There is also the ultimate BC preamp the AG series with balanced inputs and outputs -Vik
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