KA 9100, I opened the amp and cleaned it out with Compressed gas duster and cleaned out with QD contact cleaner. May need to do QD contact cleaner again. Hooked up speakers and the tuner, I have a good signal on tuner, but only getting sound and the wattage meter shows wattage - power output from the left side only. These units were in storage for 30+ years. Any suggestions or advise???