Accuphase E-260 Voltage Conversion (100V to 230V)


Hello Forum Members,

I have an Accuphase E-260 Int. Amplifier wired for 100V wall outlets. I am trying to convert it to 230V. From various threads on this forum, I could figure out that this unit has quick connect terminals for winding wires. It was less daunting to find that out!
Can somebody pls help with it's 230V wiring diagram?
(attached: existing taps for 100V wiring)

https://drive.google.com/file/d/1NBny4a2HoLRjfVGiasG48A2IoPaIcI_c/view?usp=sharing
https://drive.google.com/file/d/1N3QUV-7IBBPu5Qtk-_gk2Sw4zPJq82Vk/view?usp=sharing

Thank you.
Abhishek

eabhishek

@imhififan 

 

Thank you very much for answering so promptly. I will look into it and try to find a nice unit in Japan. I will let you know. 
 

 

Hi @imhififan 

I have successfully converted my E-270 from 100v to 120v thanks to your help. However, I keep wondering how come the conversion doesn’t affect the voltage output that goes into the internal components?  Is the internal power transformer designed to provide the same voltage output to the components regardless of the input, whether it’s 100v or 240v ? Thanks again for your help. 

@jgore 

You're welcome, glad I could help.

The function of the power transformer is to convert the mains voltage into the operating voltage required by the amplifier. It all has to do with the "turns ratio" of the primary to secondary windings. For example, the amplifier requires an operating voltage of 50V, while the mains voltage in Japan is 100V. To obtain 50V voltage, the primary and secondary winding turns ratio should be 2:1. For 120V North American mains, to obtain the same 50V secondary output voltage, the turns ratio should be 2.4:1; for 240V countries, the turns ratio should be 4.8:1.

Accuphase designed the power transformer primary winding with different turns ratio taps so we can connect the mains voltage to the designated taps to get the same secondary winding voltage.