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.