The Electronically regulated power supply is often the answer. One customer reports, "I've had my PAT-4 for about 40 years...It always had a low level hum. With the PAT-4PWR kit, the hum is finally gone". Please have a look atthe product and the assembly manual ...
Check out the PAT4 Phono Preamp Improvement Kit here. Make Your SCA-80 Better than New, too!We have a number of kits to make the SCA-80(Q) better than new. Replace your power supply and power amp modules with cleaner, quieter, more musical sound. Assembly and Installation Manual for...