The radio station I worked at used Urei 1122 preamps. We used them because they were one of the few units that had balanced outputs. I think they sounded pretty good but it is a little hard to tell with all the processing that occurs on the way to your radio transmitter. The 1122 uses transformers on the outputs to balance the signal so expect some of the same transformer sonics as a Urei 1620 balanced output. However, the circuitry inside the box is worlds better than what is inside a 1620.