Converting Kraken power supply from 220v to 110V - diyAudio
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Old 9th September 2013, 09:30 AM   #1
diyAudio Member
Join Date: Sep 2013
Default Converting Kraken power supply from 220v to 110V

Hi. I have an UK spec (220V) Alchemist Kraken Integrated Amp. I'm moving to the US and would like to know if there is any way to convert the power supply to 110V. There is no simple 220-110V switch. What should I look out for at the transformer to see if it's possible?
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Old 9th September 2013, 04:19 PM   #2
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Join Date: Sep 2004
Location: Kansas, USA
Does the mains transformer have a label? If so, what does it say about primary.

Sometimes there will be 2 identical primaries, wired in parallel for 240v use, but that can be wired in series for 110.

If you do this, get the phasing correct. The mains hot will go to the same place as before, but on only one winding. The mains neutral will go to the same place as before, but on the other winding. The two new free ends need to be connected together.

At 120v you will draw twice the current as at 240v for the same power. The primary windings have to be rated for this current. The fact that it has 2 primaries is a good clue that this is the case.

Also you need to double the current for the mains side fuse ( if it has one ).

If you don't currently have two primaries in parallel, then you are stuck.
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Old 9th September 2013, 05:11 PM   #3
Minion is offline Minion  Canada
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Join Date: May 2006
Location: Cowican Bay , vancouver island
If the transformer has dual Primaries then it would be wired in Paralell for 110v and in series for 220v , the primary might also be center tapped which would mean just changing a single wire for 110v operation .....

You should be able to look at the transformer to see how many wires are on the Primary , 4 wires good , 3 wires good , 2 wires bad ....

If the transformer is a single primary type then you could get a stepdown transformer and run all your UK gear from it ....
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Old 10th September 2013, 03:20 PM   #4
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Join Date: Sep 2004
Location: Kansas, USA
Minion is right. I said it backwards. Parallel primaries for 110, series for 220.
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Old 11th September 2013, 02:27 PM   #5
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Join Date: Sep 2013
Thanks guys. I'll have a look and see what I can find. I'll take a photo of the transformer too if that will help clarify it. I'll post back when I've had a chance to open the PSU.
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