I think what people are trying to tell you is that the difference between 3.5mV output and 5.5mV output is not going to make or break the match with the gain of your preamp. If your preamp works with only 3.5mV in, it will work fine with 5.5mV, and vice-versa. For that matter, it will work with any and all "normal" MM cartridges. The diff between 3.5mV and 5.5mV is less than 2 db.