Yosemite PreamplifierOur first tube preamplifier build began as many ampsandsound products do, inspired by icons. In this case, legendary line phono units like the C22 and Marantz Model 7 guided the basic approach to the circuit. Many of these units provide controls largely abandoned by the modern audiophile tone controls for example. These add not only additional parts, but require additional feedback to compensate for their effects, a design compromise that runs counter