Marantz 2270 - Jumper, Preamp Out - Main In

[rBuckner]

Maybe you should say more about what specifically you are talking about not working and why whatever that is the case.

It's in post #9, but it's simply going to pick up more power line hum if unshielded. I'm just talking older Marantz receivers, not other brands to be clear about that as well. This is from my own experience.

 

[Jose Jimenez]

Look over there! Another Marantz 2270 Receiver user without factory YP1000097 Main-In Pre-Out Plug!