Accuphase A-48S

@imhififan 

I think you also need to following photos to figure out.

A-48S (1).JPG

A-48S (2).JPG

A-48S (3).JPG

A-48S (4).JPG

A-48S (5).JPG

A-48S (6).JPG

A-48S (10).JPG

A-48S (11).JPG

A-48S (12).JPG

Thank you in advance.

Why didn't you send him a PM or put this on the thread where it started? This is a first..

Making Frankenamps out of wonderful Accuphase equipment - you are messing with perfection in a less than perfect way.

Making Frankenamps out of wonderful Accuphase equipment - you are messing with perfection in a less than perfect way.

Thank you for your valuable opinion. I have no intention of opposing it or arguing with it. Let's get along, anyway. What I am interested in is only quality of sound.

@imhififan 

Since it's not easy to pull out the transformer wires (although I know I must pull out the transformer wires when I actually do conversion), a friend of mine who is familiar with PCB of electronics arranged an image which explains the connector layout for me.

Here's a link of the image:

A-48S_wires (003).jpg

Also, here are links for markings/part number of the component on the 716-1362-00:

716-1362-00 (1).JPG

716-1362-00 (2).JPG

According to him, the component on the 716-1362-00 is perhaps the bridge diode for rectification.

Hopefully, these photos will help you figure out.

Thank you.

@foolishman ,

Thanks for the photos, this time Accuphase is using a PCB instead of terminal block like before. Its connection method is still the same.

Looks like your friend already understands how these connectors work! Simply swap the positions of the black and yellow wires and swap the positions of the brown and orange wires to convert the power transformer primary winding from 100V to 120V.

On the #716-0962-01 board you will need to replace the small 100V transformer with a 120V one, or simply use a resistor to drop the input voltage.

IMHO, Accuphase products are certainly state of the art in terms of build and design, and if pricing was more affordable outside of Japan, I think more Accuphase enthusiasts would be able to enjoy it.

@imhififan 

Thank you very much for providing information on how to convert 100V to 120V. I have done accordingly, and I confirm I have successfully converted voltage to 120V. According to my friend, there's another way to convert to 120V, which is to swap the positions of the orange and yellow wires and swap the positions of the brown and black wires. Do you think it is OK?

Accuphase products are certainly state of the art in terms of build and design, and if pricing was more affordable outside of Japan, I think more Accuphase enthusiasts would be able to enjoy it.

I agree.

Information you provide always helps me. 

Thank you very much again.

there's another way to convert to 120V, which is to swap the positions of the orange and yellow wires and swap the positions of the brown and black wires. Do you think it is OK?

Yes, both the 100V and 120V setups have the two primary windings in parallel, swapping the position of the orange and yellow wires and swapping the position of the brown and black wires should also work.

@imhififan 

Thank you for your response. I will let him know about it. He will be glad to hear it.

Thank you again.