Mains transformer (Murphy A146CM) - UK Vintage Radio Repair and Restoration Discussion Forum

longneck90 · 24th Feb 2020, 4:04 pm

Hello to all. I am in the process of rewinding (waiting for copper wire) the mains transformer from this Murphy A146CM radio. On dismantling transformer, I noticed that the E-I laminations were attached in twos. Ie. 2 Es together, then 2 Is. I was wondering whether there is a reason for this, as I would prefer (?) to re-attach them individually. Ie. one E, one I, then one I, one E. I hope that makes sense. Thanks in advance. All the best. John.

Ed_Dinning · 24th Feb 2020, 4:06 pm

Hi John, sometimes done like this in production or with a machine to save time, Sometimes groups of up to 5.

No difference if stacked individually, but make sure you keep the gaps where E & I butt as small as possible.

Ed

longneck90 · 25th Feb 2020, 4:17 pm

Hello to all. Thanks to ED. for that. All the best. John.

24th Feb 2020, 4:04 pm	#1
longneck90 Hexode Join Date: Sep 2013 Location: Wembley, London, UK. Posts: 395	Mains transformer (Murphy A146CM) Hello to all. I am in the process of rewinding (waiting for copper wire) the mains transformer from this Murphy A146CM radio. On dismantling transformer, I noticed that the E-I laminations were attached in twos. Ie. 2 Es together, then 2 Is. I was wondering whether there is a reason for this, as I would prefer (?) to re-attach them individually. Ie. one E, one I, then one I, one E. I hope that makes sense. Thanks in advance. All the best. John.

24th Feb 2020, 4:06 pm	#2
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,195	Re: mains transformer (Murphy A146CM) Hi John, sometimes done like this in production or with a machine to save time, Sometimes groups of up to 5. No difference if stacked individually, but make sure you keep the gaps where E & I butt as small as possible. Ed

25th Feb 2020, 4:17 pm	#3
longneck90 Hexode Join Date: Sep 2013 Location: Wembley, London, UK. Posts: 395	Re: Mains transformer (Murphy A146CM) Hello to all. Thanks to ED. for that. All the best. John.