Audio Systems: Sansui R-50, output transistors, sansui

Question
I own an old Sansui R-50 Stereo Receiver and only get sound from the right channel. I have tried switching between the A and/or B etc...but still same problem. Speakers work fine on another stereo. What could be the problem?

Answer
One channel output transistors are likely failed or there is a protection fuse inside the unit that has blown.  Realize that if there is a fuse, it may have blown because of shorted outputs.  Replace the fuse with one of the same value.  If it blows immediately, than the outputs are defective and need to be replaced.
Dan