Hello, Can any knowledgeable person advise me whether a new Marantz PM6004 amp would be noticeably superior to my old Pioneer SX-6000 tuner amp which is about 35 years old and has one channel out of action. It's quite a heavy item and is rated at 40 watts per channel and would probably have been in a comparable bracket to the Marantz in it's day. If there would be no discerable difference, then I'll just have it repaired.