Be careful of the 5000a...they had an issue back in the day where they literally used to catch on fire,due to a certain board in the design. Google "Sansui 5000a catching on fire" for more info.
Some 5000a have the faulty board,some do not.Mine doesnt. Proceed with caution.
What I can tell you about the 5000a is it is by far,the warmest receiver Ive ever heard(no pun intended). Bass is epic. For a more balanced sound I suggest the Sansui 881,or 771...or even better is the Eight Deluxe,but those are rare and $$$.
My Yamaha and Akai are brighter,and my Kenwood is a tad less bright but doesnt have the bass of the Sansuis,but its so damn sexy
Of course all these old receivers have built in tone control so you can adjust the treble&bass up or down,and some even have mids control too.