Hi, Although the choice of preamplifier depends on source and is a matter of personnel taste I had excellent results, many years ago, with an Audio Research LS2 and a ML23.5. Source was a Primare 104 cd player and speakers were Dynaudio Contour 4.0.
The most synergistic preamp for a 23.5 is the ML 26s. (see my system) They don't appear used very often but I think there's one for sale right now on the Gon. .
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