Back in the early 80's, these were an "all out" effort by Dave Belles to show off his solid-state amplifier prowess with some of his only mono block designs (with the advantages of separate power supplies). These and his other efforts obviously paid off with his Belles and OCM success. Benny Amina of Roswell Modular Electronics has recapped these and they are very quiet...never any problems/repairs. with 7' power cords, you can place these next to your speakers, minimizing speaker wire length. Blowing these remarkable 50 watt/4 ohm monoblocks out for local, quick, cash only sale for the benefit of our club members who have been wanting to get into the hi-end game or are downsizing into carefree SS. These are heavy amps - as good amps should be/used to be- but compact. \ I'll enjoy giving back and can help any newbies with good deals on speakers and cables too. Please see my other ads for more. Turner/Marietta: truman287@comcast.net.