Uber, If your new QLA7 is built for 100V, then a step-down transformer is a MUST. Do not run your turntable on US 120V. I would not even plug it in until you have a stepdown. If you mismatch the voltages, the question is not "whether" but "when" you will have a failure. Sooner or later, you will. Second point, you say that you own or have ordered a "120W" (Watts) step down. This sounds suspiciously like it should read 120V (Volts). If it’s indeed 120 Watts output, then you are way in excess of what you will ever need. No problem. What you want is a transformer that takes 120Volts input and puts out 100Volts. And it is wise to have an excess of current capability over what the turntable draws. A plaque or label on the turntable chassis usually tells you the power consumption (in Watts). Typically the Japanese DDs draw less than 20W. I use a separate 50W stepdown for each of my (two) 100V Japanese turntables that require it. I bought them off eBay.