Voltage conversion of Accuphase E-650

@imhififan My amp is E-600 (not E-650 as others’ in this thread). I am trying to convert the voltage from 100V to 120V.

Could you check the 3 pictures below and advise where these K connectors need to be moved?

https://photos.google.com/share/AF1QipOJ7YKjzYGWVqR70tglZFofPXrJeFzNjQd6v0qq0eVNDXgSI5qqQB6fRQ7QBufIbg?key=Wm8xMlRzeklvbmg2c2JwOTl3STZUVTV3NUJzYTdR

Many thanks!

@imhififan I really appreciate your sharing! This doesn't only help me but also those who have the same need in the future. 

Your answers address more than what I have asked!

I have another question though, after desoldering K3 to K5, do I need to fill the empty holes in K3 and K5 with lead or they are ok to be empty?

@imhififan Many thanks!!!

@imhififan I'm sorry for my typo, please ignore my previous questions. What I meant is: after desoldering K3 to K5, K4 to K6, do I need to fill the empty holes in K3 and K4 with lead or they are ok to be empty?

Hi everyone, 

I have the E-600 amp and I am thinking of converting the voltage for it. 

Does this conversion change the sound quality? 

If I don't have dim bulb tester, is there any other way to test?

Thank you.