The MARANTZ Qr-450 Quadrascope AM/FM Receiver . The main issue is the speakers and the volume. The rear speakers don’t work. On AM the front speakers work fine. Switching to FM the volume to the front speakers is low not loud enough . The right speaker sounds like if the signal was low I try different wires for antenna and didn’t work I don’t have a fm antenna. The left speaker sounds much more clear but the volume is not higher. So I try the record player and the volume is normal using mono mode but switching to two or four channel only the left speaker works the right speaker is not loud enough sounds like the fm radio. Selling for parts or repair. See photos for condition