Vince has a Sansui receiver from the 70s. Can he still use it with his home system and his Pioneer Elite Plasma TV? Leo says to check out ClassicReceivers.com. It really comes down to the output. He won't be able to use it for video, though because of the HDMI connectors. He can get a device that will take the audio portion and route it to the old Sansui device.
Scott Wilkinson says that Vince's Pioneer Plasma TV will have analog outputs that he can take the audio for and route the preamp output directly to the receiver.