These two preamps are tonally sufficiently different to make your choice fairly easy. IMHO the SP10 is more balanced and, if it errs it, it errs on the slightly warm side of neutral. The LS25 is more tonally cool and, perhaps, offers a small bit more resolution. The down side of the SP10 phono stage is that it sounds best with medium to high out put cartridges. It has too much noise with low output moving coils. I've listened to a lot of pre amps in the past 20 years and nothing has tempted me away from my SP10 yet. I've always like the idea of have the phono pre-amp built in - one less set of cables and tubes to fret about.
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