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ADA Power Amps => B200s => Topic started by: vmaxvmax on December 24, 2019, 06:13:24 AM

Title: Convert or change input voltage
Post by: vmaxvmax on December 24, 2019, 06:13:24 AM
Hi,
Is it possible to rewire a USA model for EU voltages or is the tranny country specific?
Cheers and merry Christmas everybody!
Title: Re: Convert or change input voltage
Post by: rnolan on December 24, 2019, 08:09:12 PM
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.
Title: Re: Convert or change input voltage
Post by: vmaxvmax on December 25, 2019, 04:53:59 AM
Great, thank you.
Title: Re: Convert or change input voltage
Post by: MarshallJMP on December 25, 2019, 12:24:25 PM
You need a transformer with two 30V, 4A windings.
Title: Re: Convert or change input voltage
Post by: vmaxvmax on December 26, 2019, 12:33:30 AM
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.

Title: Re: Convert or change input voltage
Post by: Aelfad on December 30, 2019, 02:22:04 PM
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.
Title: Re: Convert or change input voltage
Post by: rnolan on January 07, 2020, 08:16:28 PM
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.