I have a bad hum in the right channel of my Pioneer sa-7100. All other inputs work. I have rebuilt the phono board and cleaned the contacts. I removed the selector switch and cleaned it while it was out. It is not the wire to the turntable. It is only the right side input. I have checked all the wires to see if they are broken and solder joints and all look good, In fact, it looks like new on the inside of the amplifier. Anyone have this same problem before?