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Lets get Technical > All Things Tube All about preamp and power amp Tubes.

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Author Topic: Convert or change input voltage  (Read 2603 times)

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vmaxvmax

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Convert or change input voltage
« on: Time Format »

Hi,
Is it possible to rewire a USA model for EU voltages or is the tranny country specific?
Cheers and merry Christmas everybody!
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rnolan

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Re: Convert or change input voltage
« Reply #1 on: Time Format »

B200s is an easy change but you need to change the transformer.  There's room to mount a toroidal, you just need to buy one with the correct voltages.  I'm pretty sure I posted about this ages ago when I did one.  MJMP can tell you the voltages you need IIRC it was +30v -30v 6amp?? but it was a while ago.  I found a perfect toroidal online.  The toroidal mount with one bolt so you only have to drill a hole in the top cover and wire it up.
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vmaxvmax

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Re: Convert or change input voltage
« Reply #2 on: Time Format »

Great, thank you.
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MarshallJMP

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Re: Convert or change input voltage
« Reply #3 on: Time Format »

You need a transformer with two 30V, 4A windings.
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vmaxvmax

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Re: Convert or change input voltage
« Reply #4 on: Time Format »

Thank you!

I had found one on eBay for $45 in the US but unfortunately the seller wouldn't export and in the end, it went for $45 to a single bidder...

Such is life!

I let my original B200 go to rust in a garden shed in the 80's after buying a Marshall 9100.

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Aelfad

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Re: Convert or change input voltage
« Reply #5 on: Time Format »

If you can't find a ready-made transformer, look for some winding services. You'll definitely find them on the Internet or just ask in your local electronics store.
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rnolan

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Re: Convert or change input voltage
« Reply #6 on: Time Format »

Just buy a decent "new" toroidal with the correct voltage/amp (240v input - 2 x 30v 4amp outputs)  I found one in Australia online really easily.  The one I bought here fitted perfectly so check that the dimensions will work in the B200 case.  The toroidals are circular and mount with one bolt through the center.
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