Gentlemen,
Thanks for the advise, as this is what I needed to confirm. Sometimes my brain has other ideas and good to know this time it was right.
The B&O 3400 is a belt drive and came with Ortofon's
MMC20EN cartridge. At the time, only the 4004 was the step up. All is original and hopefully this weekend, I will set up the Yamaha C-6 preamp (MM,MC) and feed the Denon thru an aux input. That should make the Denon happy.
The only issue with a phono stage is the questions concerning loading the cartridge properly. Several models mention the loading subject and yet others have no mention. Then too, wonder if a new turntable is justifiable. I'm sure the diamond needs to be inspected also.
Until the next time.....kt