Phous, my CDP -700 was brand new and had it running for about a month straight without shuting it off. I went on vacation and turned it off....came back from vacation, turned it back on and the fuse blew. I went to Radio Shack got the right voltage slow blow fuses and it blew all four of them. I went to an electrucal store and got the ''real deal '' in fuses that were about $10.00 for 4 of them - as Radio Shack's are cheap. It has been okay since then....but this seems to be an issue with these pre-amps. Find a good electrical store and get real UL listed fuses and see what happens