+1 on not worrying about service. Most will never need service, they are built to last a lifetime and Audio Research prides itself on servicing older models and having an extensive parts stockroom. Should you keep it for decades, then any competent electrical repair can update the caps.
Well o so fast. As a repair facility, we have had 5 ARC older products in the room for repair recently. BUT they can be repaired and also upgraded to improve the sound so that I would agree with.
Happy Listening.