Onkyo Delta Power Supply circuit Design Stereo Power Amplifier M-5200

This unit is in fair physical condition.  Please look closely at all supplied photos to see small defects.  I  powered this up and it came out of protection mode very quickly.  I hooked up a working tuner and a pair of speakers.  I soon found that the lack of a volume control on the amp would not allow me to test the amp through the speakers  I used a pair of headphones plugged into the amp to test sound.  I was able to tun into raidio stations and hear clear sound through the amp.