I have Bang & Olufsan Beogram 1700 connected to an Onkyo TX 5000 amplifier. They've been in my antic for some 40 years along with old records. I'd hoped to be able to play the records but sadly no sound. The amplifier has power but no sound comes from the radio either. I connected some budget speakers to the amplifier but no sound comes from the speakers. I don't know where to begin. Any advice or help would be greatly appreciated. I was really looking forward to going back in time to hear my old records. Where to I begin