I am listening to a Threshold S150 series II that was restored for me by Frank Mufich. The power caps were replaced, the electrolytics were replaced and the amp was biased and gone over in great detail. The fuse holders were replaced and new feet installed. The amp looks new and sounds fabulous. I recommend Frank highly, especially if you are in the Dallas Ft.Worth area and need work on a piece of equipment. He works out of his house and has a fully equipped lab. He is friendly knowledgeable and the work was done in a timely fashion.