Step Down Voltage Converter

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tomorrowstops
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Step Down Voltage Converter

Post by tomorrowstops » Mon Feb 09, 2015 11:18 pm

Stupid question:

The MS20 I bought is 100v (stamped on the serial number plate), but it has an American 2 prong plug end. Do I need to adapt it to a Japanese 2 prong plug end before I use this step down converter?

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Stab Frenzy
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Re: Step Down Voltage Converter

Post by Stab Frenzy » Tue Feb 10, 2015 1:41 am

Probably not, 20% voltage difference should be handled fine by the power supply. Also the fact that it has a US plug on it suggests that the transformer may have been modified for US voltage already.

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Re: Step Down Voltage Converter

Post by tomorrowstops » Tue Feb 10, 2015 1:52 am

I'm assuming its a US plug - its two flat blades, non polarized (both blades are the exact same size).

There seems to be a lot of confusion regarding this topic. Some people say the 100v transformers won't last very long on 120v supplies. Others agree with your opinion, Stab. I've read things like 'built in tolerances can handle more voltage' and 'power spikes are frequent in Japan, so they build power supplies to handle such events'

It certainly operates normally when I plug it into the wall...

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Re: Step Down Voltage Converter

Post by rschnier » Tue Feb 10, 2015 6:39 am

For what it's worth...Based on a quick Google image search, power outlets and plugs in Japan are physically identical to those in the US.
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Re: Step Down Voltage Converter

Post by tomorrowstops » Tue Feb 10, 2015 1:35 pm

Yeah, thats what I came across as well. Looks like there is also the round 'pole' style there too though, much what looks like fits into the Japan 100v outlet on this box. No matter, I'm going to return this one, and go to my local industrial electronics store (should have done that in the first place! ) and see if those guys can recommend a course of action.

For now, I'll run her straight into the wall. Goddamn this thing sounds beautiful!

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Re: Step Down Voltage Converter

Post by vicd » Tue Feb 10, 2015 3:46 pm

I keep hearing about how Japanese lower mains voltage tolerances (100V +/- 10% , translates to the range of 90-110V), may lead to power supply components (VRs' and caps?) heating more and wearing out earlier when working with the US' 110V.

110V (or is it centered at 117? yet worse) formally, at the same +/-10% tolerance would span anywhere between 99-121V, which may be "beyond what the Japanese PSU were spec'd to comfortably handle".

Depends on the actual build quality and components used in the PSU, so there's no rule of thumb I guess.
Last edited by vicd on Wed Jul 29, 2015 7:51 pm, edited 3 times in total.

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Re: Step Down Voltage Converter

Post by synthroom » Tue Feb 10, 2015 5:55 pm

I have a Sansui 6-track Mixer (MX-6) that was grey market from Japan with 100V mains in from Sam Ash that's about 25 years old and it's still working.
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Re: Step Down Voltage Converter

Post by rschnier » Fri Feb 13, 2015 7:18 pm

vicd wrote:110V (or is it centered at 117? yet worse)
It's actually centered at 120, and many places I've lived and played at in the US, it was near 125. I would be extremely wary of operating anything designed for 100V on typical US voltages for any length of time, but as the saying goes "your mileage may vary!"
-- R.

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