Audio Research, SP-3A-1 Preamplifier - Classic Perfection - SOLD

So this ARC SP3A-1 all tube preamp was the prized possession and top dog processor in Richard Ks vinyl rig. He spent a lot of time and a lot of money updating this preamp to provide continuous trouble free service well into the future. We love old preamps because they are infinitely repairable and contain no semiconductors that are difficult to track down - all quality discrete components. As you can see by the accompanying documentation, ARC in 2010 did a tremendous amount of work on this piece upgrading its discrete components so as to not change the sonic signature of this preamp, and all replacement components were selected with care from larger batches and carefully matched. Audiophile magazine said of this little preamp in 1971: "We thought Audo Research's previous-model SP-2C (footnote 1) was excellent, but this is even better—the closest thing available, in fact, to the ideal straight wire with gain" - so I wanted to ensure I did not change anything that would effect the sonic