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Accuphase voltage conversion

I have a Japanese market Accuphase E-370 for which I plan to use an external voltage converter for 120v.    Looking inside this Integrated, it no longer appears to have the jumpers which allowed easy voltage conversion.    Are all the new Accuphase products similar?     Does anyone know how to change the voltage internally?   Thanks 
pip555
czarivey
5,946 posts
 
Bear in mind that local Accuphase distributor won’t be very happy knowing that you have Japanese unit. By their terms it’s "Unauthorized" and they will simply refuse to provide service.
Contact Japanese service provider preferably via Japanese website.
Tell you’ve moved to USA using Japanese and not English.
The other simpler way is to wire 240V dedicated line out of the distribution box. Thus no internal mods needed.
georgehifi's avatar
georgehifi
10,312 posts
 

If you have no switches or fuses to change the mains voltage all is not lost.

It all depends if the mains transformer has the number of wires on the "primary side" of it to be able to be reconfigured for different mains voltages, you need a tech to look and see if it has. If so it can be as small as a 15min job.

Cheers George

pip555 OP
8 posts
 
Thanks for all the replies.  From what I have read on other forums, the Accuphase transformer is multi-tap (therefore multi voltage), so in theory, all one should have to do is rearrange the transformer wires.  All I require is a photo, or a schematic of someone who has a 120v version.  

When I purchased this unit, I knew that being from the gray market, I would not have access to service or assistance from Accuphase.    I don't mind using a step down transformer, but I am curious how to convert this unit internally.    


czarivey
5,946 posts
 
There are certain logical ways to examine which unused taps should replace ones already currently connected. 
Often on PCB you can spot the input AC voltage printed than measure voltage accross the unused taps so it's the desirable one to be connected.
For safety I'd disconnect power transformer and run tests with 220V than run tests with 110V so to find matching unused taps. The color code on output taps of power transformer can often give you some tips, but to be sure measurements can give you precise picture of your project.

georgehifi's avatar
georgehifi
10,312 posts
 
pip555 OP
Thanks for all the replies. From what I have read on other forums, the Accuphase transformer is multi-tap (therefore multi voltage), so in theory, all one should have to do is rearrange the transformer wires. All I require is a photo, or a schematic of someone who has a 120v version.

When I purchased this unit, I knew that being from the gray market, I would not have access to service or assistance from Accuphase. I don’t mind using a step down transformer, but I am curious how to convert this unit internally.



Pip555 this is a very dangerous way to go about it to be told how to do it..

If you don’t know how to do it "by measuring the primary windings with an ohm meter", to find out which way to wire it up. Please give it to a qualified tech who does know and will do it this way, as he won’t go by just being told, he’ll measure twice adjust once. Just like a good carpenter, who measures twice cuts once.

As not only can you blow the amp, but also yourself in changing things in this area..


Cheers George


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