Accuphase E600 voltage conversion

Thank you for your input!

@imhififan

I have converted the voltage to 120v. All is good except for one thing.

I used the 3-prong US power cord (the one with ground prong) to test.

When the amp is on and no music is played. If I stand close to the speakers, I can hear the white sound from the speakers.

I suspected this has something to do with ground prong so I removed it and tried again. The white noise disappeared completely. I played some test tracks for 3 hours and found the sound is exactly the same as when the amp was on Japan voltage.

I wonder if there is any way to fix the white noise issue with the ground prong?

Thank you.

Please note that, I filled the K3 and K4 holes with lead to strengthen the board. 

@quanghuy147 

If you disconnect ALL sources from the E600, connect ONLY the speakers to the E600 and use a 3-prong power cord to power up the E600, can you hear any noise if you turn up the volume?

@imhififan I just came home from work and test. When I disconnect all sources from E600, only the speakers are connected to the E600, 3-pong power cord is used, I don't hear any noise even when I turn up the volume to 12 o'clock position. 

When I disconnect all sources from E600, only the speakers are connected to the E600, 3-pong power cord is used, I don't hear any noise even when I turn up the volume to 12 o'clock position.

I believe the noise problem is not the E600, please connect the sources one at a time to test and see which one causing problem.