Hi,
Your question has an easy answer.Turn the amp you bought around to the back side.On the left side is an octal socket(black),this was used to plug a Marantz mono preamp directly into the Marantz amp(because it needed high current).This feature only exists on the older less popular Marantz 8,the 8b does not have an octal outlet socket.Good luck,any other questions fire away.Olenorge@aol.com
Your question has an easy answer.Turn the amp you bought around to the back side.On the left side is an octal socket(black),this was used to plug a Marantz mono preamp directly into the Marantz amp(because it needed high current).This feature only exists on the older less popular Marantz 8,the 8b does not have an octal outlet socket.Good luck,any other questions fire away.Olenorge@aol.com