@joaop_ferreira
Welcome to the forum!
I will be visiting Japan and would like to buy an Accuphase E303. Do you think that the wiring system is similar and that it would be possible to convert it to 230V AC ?
Yes, you can download the service manual at https://elektrotanya.com/accuphase e-303, It shows voltage conversion.
If you know these devices, which one do you prefer? E202 vs E303?
IMO, Accuphase's newer models generally have better specs than their predecessors, and I would choose the E-303 over the E-202.
Do you think they can marry well with a pair of Ditton 66? I have currently a Citation 16+17 and I am not happy with the result.
Sorry, I have no experience with Ditton 66. Maybe other forum members will climing in to give you advises.