About 4.5 years ago, I had 3 vintage Sansui receivers. They were great receivers - made well, sounded great, etc. I cleaned them up with Deoxit (on the buttons, pots and controls) to get rid of any static sound that was present when you'd use the switch. One, I went as far as replacing the vinyl veneer with new veneer on the cabinet. I bought some "new-old stock" panel lights from a guy that was selling some off in limited quantities. It seems the parts get a little bit harder to come by as time goes by.
Then, we were planning a move, so I decided to sell them all off. Sadly, one of the receivers (the one I re-veneered) was damaged during shipment to the buyer. It could not be brought back to life. So, that one was disposed of.
AudioKarma.org has a thread where you can input your serial number of your Sansui receiver - as well as a good forum dedicated to classic gear.
Enjoy your Sansui!