I have a slightly different wrinkle to add to this discussion. I too have an older ARC line stage. In my case it is the LS-15. Although old, and a step down from the LS25 my LS15 was modded a few years ago by Steve Huntley when he owned Great Northern Sound. I don't recall the specifics but he did a pretty major revision and upgraded a lot of parts. The modification also included a set of NOS tubes. It seemed to be a significant upgrade to the original LS15 but like the original poster, I wonder how it compares to the newer preamps. Is anyone here familiar with the Great Northern Sound modifications...and would care to speculate on the sound quality my preamp relative to the newer models?
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