Hi. I recently purchased a STAX SR 3030 system and I have noticed something strange. I have purchased this same amplifier in the past as well as a 323a and 323s. When I turn the left channel knob, I usually feel grinding and I'm pretty certain that it is uneven. Is this common with STAX amplifiers? Everyone I've owned was in near mind condition, and still I had this same problem.
Also, I purchased this 3030 system not knowing that is was the 100v. model. I live in the Chicago area. Is it important that I get a step down transformer? If so, why and could someone link me to one? Not sure how they work.