Last year, I had my Kenwood KT-8300 modified by Joseph Chow at Component Plus USA. He upgraded caps and resistors, upgraded the power supply, replaced internal wiring and installed an IEC connector to use an upgraded power cord and installed high quality gold plated RCA outputs. The results??? Fantastic. Deeper, more controlled bass, quieter background, increased signal, improved soundstage. Quite a feat for a tuner. Visit the website at www.componentplususa.com. There are several upgrades to choose from. Email them with any questions. I plan to send him my Kenwood 600T to upgrade in the coming months.