[sdiy] MKS-70 Switch internal transformer from US 117 to UK 240

[cheater cheater]

Hi,

I think you will not need to change the filters as the components
there depend on the frequency of the AC. From what I know it's usually
a low-pass filter that tries to filter out spikes, but check that.
Anyways the difference between 50 and 60 Hz is so small that if you're
adapting a 60 Hz item to 50 Hz you can usually leave the filter the
way it is; it's supposed to filter out things much much higher than
that.

And yes, change the fuse. But I think the service manual should have
information of what exact type you should be using.

I like your cable idea. What are you using for the power conditioning?
Is it silent (as in, no hum/buzz/noise/"bacon" heard from the box
itself?)

Thanks
D.

On Sun, Sep 26, 2010 at 17:09, random variate
<randomvariate at hotmail.co.uk> wrote:
> Hi Tom
>
> Thanks for that, am currently standardising all my kit to iec c14 plugs so I can run them off a power distributor - eg: all rack kit on a standalone floorstander, without the need for adapters to be plugged into a trailing floor socket - the adapters are sometimes so wide that the socket beside can't be used as there's not enough room to fit another in. A few bits of kit have built-in power cables ending in UK 3pin plugs or moulded figure of 8 cables ending in 3pin plugs.
>
> It's tiresome but will be a more efficient use of space and negate the need for trailing sockets.
>
> As for the RF and EM cleaning? Well, there might be some loss of noise, but the main thing I'm aiming for is each rack to be 'standalone' with only a power lead for the distributor, a pair of audio leads from the submixer and a single USB lead from the midex interfaces I use.
>
> Next up is standardising US square power chassis plugs to iec c14 connectors.
>
> Them there's the mks70 conversion and finally the PolySix, as it's in storage.
>
> Any notes very much appreciated, especially a recommendation of a transformer.
>
> Looking forward to getting rid if all the various power cables and using standard iec kettle leads.
>
> Cheers
>
> Tim
>
>
>
>
> On 26 Sep 2010, at 11:46, Tom Wiltshire <tom at electricdruid.net> wrote:
>
>> Hi Tim,
>>
>> Drop me a line when you get to doing your Polysix. I converted one from US to UK mains voltage some many years ago, but I know I've got the notes I made at the time, so I could dig those out for you. I also know that it worked! I can't remember whether I needed to replace the transformer though, but I suppose the notes will tell me.
>>
>> Back in the day, you could pick up a Polysix for $60 in Roswell, New Mexico. The aliens left it behind, allegedly.
>>
>> Regards,
>> Tom
>>
>> On 15 Sep 2010, at 11:57, random variate wrote:
>>
>>> Hi there everyone, newb here
>>>
>>> I'd like to get rid of my step up transformer wart on my US model MKS-70 and have checked the internal transformer:
>>>
>>> Currently soldered on 117v point and 0v point
>>> There are 220v and 240v winding points
>>>
>>> The power filter board has a 250v rated glass fuse
>>>
>>> 1.  So, is the switch as simple as de/resoldering from the 117v point to either the 220v point or 240v point
>>>
>>> 2. Would anyone suggest using the 220 rather than 240v point?
>>>
>>> 3. I'd also like to swap out the 2 pin US square power socket for a Euro 3 pin IEC 'kettle' socket - there's no grounding though? Should I just leave the grounding or would you suggest a chassis pin?
>>>
>>>
>>> Advance thanks
>>>
>>> Tim
>>>
>>>
>>>
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>>
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