Mingus- The problem your having is a common one. If its asignal or D.C. (Voltage Controled I.C.)attenuator it has a build up of carbon, dust and or dirt. Best remedy is to clean it with,listed in order of perference, Caig deoxit red or LPS#2. Do not use your local stores tunercleaner. All can be had at www.mcmelectronics.com or 18005434330.
