Do you also suggest changing the fuse and amplifier power cable to meet new current requirements? I am not able to locate the fuse though.

Yes, for safety reason, changing the main fuse is a must!
Usually you can find the fuse on the power switch pcb or soft-start board in a Accuphase integrated, and its clearly specified the fuse rating requirements on the board.
For power cable, you can either buy a new cable or some kind of plug adapter, I always found Accuphase cable are good enough for my use.

https://images-na.ssl-images-amazon.com/images/I/61KBr4YNf6L._AC_SL1500_.jpg

I am gonna make these changes and report back if it worked.

Before you swiping the wires, measure the resistance across tap 2 and tap 4, after conversion the value should be about 4 times higher.
https://www.stereo.net.au/forums/uploads/monthly_06_2014/post-116892-0-01154100-1402272457_thumb.jpg

I also strongly recommend to use a 230V 100 watts Incandescent light bulb in series to power up the amp at the first time after voltage conversion.
If anything goes wrong the light bulb will simply light up instead of dimming and save the amplifier from any damage.

Abhishek,
Glad I could help

@frankhhh

I believe E-270 basically has the similar connection, Accuphase changed the color code on E-270 primary winding wires from E-260.

Sorry I can’t see the color very clear from your picture, please confirm if the setting shown on your picture is 100V Japan voltage? and also confirm if the colors are correct as following:

Pin 1 = None

Pin 2 = Yellow

Pin 3 = Orange + Black

Pin 4 = Brown

Pin 5 = Blue

Pin 6 = Red + Gray

Pin 7 = None

BTW, below is a picture similar to E-260 primary winding color code, except the blue wire should be violet on E-260.

Once you confirmed which wire belongs to which primary winding by a DMM, voltage conversion should be quite straightforward.

 

 

I'm glad everything worked out fine.

🥂

Thanks @frankhhh for posting the pictures of E-260 and E-270.

If I understand you correctly, E-260 and E-270 primary winding color as follow:

winding on E-260 / E-270

1. 120V orange / yellow

2. 100V red / orange

3. 0V gray / red

4. 120V yellow / brown

5. 100V brown / black

6. 0V white / gray

7. T. fuse violet / blue

If above color code is correct, the voltage settings of E-270 should be as below ( pin numbered from left to right according to provided picture ):

120V setting : pin1 = None, pin2 = orange, pin3 = yellow + brown, pin4 = black, pin5 = blue, pin6 = red + gray

220V setting : pin1 = black, pin2 = yellow, pin3 = orange, pin4 = red + brown, pin5 = blue, pin6 = gray

230/240V setting : pin1 = black, pin2 = orange, pin3 = yellow, pin4 = red + brown, pin5 = blue, pin6 = gray

 

 

@frankhhh

As I mentioned, confirm which wire belongs to which primary winding by a DMM!

If convert 100V to 220V or 230/240V, you need to 100% sure the resistance between gray wire and blue wire is 0 ohm, use a ohm meter to measure before connect the gray wire to pin6.

 

@jgore 

The power switch is responsible for switching the mains voltage, unplugging the power cord when not in use will not help.

If you want to avoid wear and tear on your power switch and minimize stress on  power supply components during the turn-on process, my suggestion is to install an outlet with a built-in switch and a simple resistor soft-start circuit.

https://sound-au.com/articles/soft-start.htm

@jgore 

The message system does not support links, why not post them to this forum?

 

If following the voltage conversion table to 120v from the e-260 service manual, and apply the rewiring on the e-270, it turns out that pin 2 should be black and pin 4 should be orange.

@jgore 

Pins 2 and 4 are not connected to any part of the circuit, they are there to house unused wires. So it doesn’t matter if the black and orange wires are on pin 2 or pin 4.

Connect the yellow and brown wires to pin 3 to set the voltage to 120V.

Hope this helps.

does it matter which wires go on top and on the bottom of pin 3 ? 

It doesn’t matter.

the fuse is currently used on a 120b Hegel H190 and it’s rated at 10AT ( slow blow)

IIRC, the fuse in the E-270 is 5A slow blow, your 10A SR fuse will not provide desired protection.

 

@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.

 

 

 

@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.