In the 1970's Frank Van Alstine had the stones to offer a slight redesign of the pre-amp everyone considered THE pre-amp to own, the Audio Research SP-3. In his writings he explained exactly what his circuit changes did (improved the SP-3's linearity, improved the phono stage's low-frequency overload characteristics and corrected it's slight RIAA EQ curve inaccuracy--- main priorities in Frank's designs), and why the SP-3 needed those changes. It proved that, though Bill Johnson was a fine designer, he wasn't omnipotent!