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

random variate randomvariate at hotmail.co.uk
Sun Sep 26 18:04:42 CEST 2010


Thanks all for continued advice

Power conditioner/distributors: Samson powerbright and Phonic PPC series

Nothing flash, just affords tidiness, surge protection and allegedly some RF and EM cleaning (though not sold on that)

Main thing is 10 power points at top of racks, with some rack lights





On 26 Sep 2010, at 16:48, cheater cheater <cheater00 at gmail.com> wrote:

> 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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