Rewiring transformer on a McCormack dna for 220v

IsakAlexander · 9th November 2011, 10:40 AM

I understand this transformer can be rewired for operation on 220v by connecting primary windings in series?
Have a look a the picture (love it when manufacturer have a scheme on it like on vintage gear)
I would appreciate a step by step guide on how to proceed. My electronics understanding is limited to changing output devices, caps and simpler stuff.
Do the secondary wiring need to be changed as well?

It´s a McCormick DNA 0.5

Tajzmaj · 9th November 2011, 01:20 PM

Secondary wiring is ok.
Primary needs that you connect 0V black and 117V white/red wires together. black/red and white are 220V primary than.
Regards, Taj

IsakAlexander · 9th November 2011, 01:29 PM

Thank you, this was my conclusion also. Nice to get it confirmed.

Tajzmaj · 9th November 2011, 01:42 PM

You are welcome.
Taj

IsakAlexander · 9th November 2011, 04:15 PM

It works very well

and I did change the powerfuse to 220v spec.

Tajzmaj · 9th November 2011, 04:21 PM

I'm glad...hehe

9th November 2011, 10:40 AM	#1
IsakAlexander diyAudio Member Join Date: Sep 2006	Rewiring transformer on a McCormack dna for 220v I understand this transformer can be rewired for operation on 220v by connecting primary windings in series? Have a look a the picture (love it when manufacturer have a scheme on it like on vintage gear) I would appreciate a step by step guide on how to proceed. My electronics understanding is limited to changing output devices, caps and simpler stuff. Do the secondary wiring need to be changed as well? It´s a McCormick DNA 0.5

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9th November 2011, 01:20 PM	#2
Tajzmaj diyAudio Member Join Date: Mar 2011 Location: Ljubljana	Secondary wiring is ok. Primary needs that you connect 0V black and 117V white/red wires together. black/red and white are 220V primary than. Regards, Taj

9th November 2011, 01:29 PM	#3
IsakAlexander diyAudio Member Join Date: Sep 2006	Thank you, this was my conclusion also. Nice to get it confirmed.

9th November 2011, 01:42 PM	#4
Tajzmaj diyAudio Member Join Date: Mar 2011 Location: Ljubljana	You are welcome. Taj

9th November 2011, 04:15 PM	#5
IsakAlexander diyAudio Member Join Date: Sep 2006	It works very well and I did change the powerfuse to 220v spec.

9th November 2011, 04:21 PM	#6
Tajzmaj diyAudio Member Join Date: Mar 2011 Location: Ljubljana	I'm glad...hehe

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