Refurbished Nutone 478 Control Amplifier for Apartments. We also have replacement speakers both new and used. The item "Refurbished Nutone Intercom 478 Control Amplifier for Apartments use with N-485" is in sale since Friday, October 20, 2017. This item is in the category "Home & Garden\Home Improvement\Home Security\Door Entry Systems & Intercoms".The seller is "stevesnutoneshop" and is located in Rockaway, New Jersey. This item can be shipped worldwide.