These are very different sounding preamps. The LS16 mk2 uses the 6h30 tube while the ls25 mk1 uses the 6922. I currently own an LS25 mk2 which also uses the 6h30 tube. I had an original LS25 (mk1) for about a month before I bought my mk2. and I was not impressed with it. I passed on it My mk2 is a much better sounding pre. The LS16 mk2 is a better sounding pre. I would wait for a LS25 mk2 or buy the LS 16. Audio Research preamps have come along way in the last 10 years or so.
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