I have an early (1959) brass-face X-100, which has two phono inputs: 100k (phono 1) and 50k (phono 2). I had been using both inputs for two turntables (using loading plugs with phono 1 to lower the resistance). The other day I removed the table from phono 1, and you know what? It sounds significantly better with just a single turntable connected. Greater frequency extension on top and bottom, greater clarity, and a more vivid soundstage as well. It may possibly be a little louder too. What a nice surprise! Presumably in 1959 the designers didn't expect that consumers would own two turntables, they just wanted to offer more versatility. I'm guessing that the second turntable was putting an extra load on the circuit. Can any of you more tech-savvy folks confirm?