Here we have the Sansui 5000x receiver. It was produced in the early 70’s and was a very popular unit. It puts out 55 watts per channel and weighs in at around 40 pounds. It features dual tuning capacitors, two phono inputs and a tunable FM IF circuit. There are a few different versions of the 5000. I believe the original Sansui 5000 was introduced in 1967 followed thereafter by the Sansui 5000a in 1969 and then the Sansui 5000x in 1971.
There is a known issue with some of the 5000 series Sansui’s. The early version of the amplifier driver board tended to get hot. Very hot. Sansui remedied this by changing the board in later production runs. The defective board is numbered F1040 or F-1020-1 while the upgraded board is numbered F6013. If your 5000 has the older board you may want to think about having it upgraded by a competent tech. Most 5000 and 5000a models probably had the defective board while some of the early 5000x units had the board. If you want to see what’s involved in repairing this issue there is a great thread on it at AudioKarma.org.
The Sansui 5000x uses the C7 wood case. The 5000 and 5000a wood cases looks to be slightly different.
As I mentioned Sansui made quite a few of these receivers so they are not uncommon. They are good performing units but just be sure to get a later model 5000x to avoid the defective circuit board. A good working 5000x will sell for $300-400 fairly easily.