Accuphase E-303 Repair 3 - Popping Noise (Power Supply)

This is the third video regarding the amplifier repair for Accuphase E303. The unexpected poping noise came out when I did the listening test. These vintage amplifiers used a lots of differential circuits design. Although it improves the sound quality, also may cause the popping noise when the DC output out of balance (0V) due the the leaks of aged transistors.I hope this video can provide some troubleshooting ideas for dealing with popping sound problems.