Accuphase E650 and E470 voltage conversion

That's really really nice to know, thanks for your expert advise

I am using regulator because in my country the voltage is 240v and at times it goes up to 251v (highest that I seen), but most of the time it's hovering at 243-248v

The Accuphase marked 220V should be able to accept 207V - 253V. If you live in UK, 216.2V – 253.0V is within the acceptable range, otherwise you should contact your power company. 

Hope this helps

That's really good to know, as I see the mark behind the power input it only states 220v, but are you advising that it is safe to run up to even 240v with some tolerance of +/- %, I am using regulator because in my country the voltage is 240v and at times it goes up to 251v (highest that I seen), but most of the time it's hovering at 243-248v

It just tickle with me on the voltage, grrrr

The Accuphase E650 and E470 come with three voltage setting: 100V, 120V and 220V-240V. If your amplifier is set to 220V, it is safe to powered between 220 to 240V and no need to use a regulator.