A friend of mine and Polk Forum member Analog97 (Larry) has built the Clarinet preamp and the Cornet phono pre. He's using a Parasound Halo A21 (250 wpc) to power his big SDA's and the sound is magnificent. Larry has a number of Hagerman product builds. Check out the hagtech.com website or the Hagerman Forum over at Audiocircles. Jim Hagrman is an experienced audio electric engineer. The quality of his kits are fabulous. His PCBs are twice as thick as the boards that you will find in other kits or manufactured retail components. Top quality! A well build Hagerman kit may cost around $500, but I guarantee you that you will spend much more than that to hear a better sounding phono pre or straight preamplifier. His circut design MU cathode follow is being used by Modwright, Rogue and other audio designers. Great stuff here!