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 Post subject: Order of power transformer windings?
PostPosted: Nov Mon 27, 2017 2:29 am 
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Joined: Nov Sun 04, 2007 6:01 am
Posts: 2696
Location: Redding, CA
From inside to outside, what was the convention for the order of windings in power transformers around 1960?

Norman

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 Post subject: Re: Order of power transformer windings?
PostPosted: Nov Mon 27, 2017 2:35 am 
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Joined: Sep Mon 16, 2013 2:42 am
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Location: Tucson, Arizona U.S.A.
Primary next to the core, high voltage secondary next, low voltage windings on the outside. But this is just how it was "usually" done. Some manufacturers did it other ways.

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 Post subject: Re: Order of power transformer windings?
PostPosted: Nov Mon 27, 2017 4:59 pm 
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Joined: Jun Fri 19, 2009 6:34 pm
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Location: Long Island
There was no difference between 1960 and 1920 or 2017. The placement of the windings is determined by the space available on the core. In most electronic power transformers the primary is usually a small number of medium diameter turns so it occupies the least volume and comes first; the HV secondary is a large number of turns of fine wire so it occupies more volume and comes next; then the LV secondaries are a few turns but the wire is much greater in diameter than the HV or primary windings, so they occupy the most volume and come last. Putting the thickest wire on the outside also allows it a greater bend radius which is important for long life and durability.

But there are no hard and fast rules on this; manufacturers juggle the windings as needed so they can use standard size laminations as efficiently as possible to build as many transformers as they can.

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 Post subject: Re: Order of power transformer windings?
PostPosted: Nov Mon 27, 2017 5:37 pm 
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Joined: Nov Sun 04, 2007 6:01 am
Posts: 2696
Location: Redding, CA
Thanks for your replies. I will be seeking a replacement!

Norman

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 Post subject: Re: Order of power transformer windings?
PostPosted: Nov Tue 28, 2017 12:00 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4879
Location: 253 Blanche St. Plymouth, MI USA
HAving the filament windings on the outside allows you to modify a 6.3v filament to become a 2.5v or 7.5v one if you need. I made such a modification on an old 50's TV tranny to make it replace a 1929 era Zenith that wanted TWO 2.5v windings , a 7.5 and a 5v rectifier as I recall. Worked perfectly.
Mark Oppat
Antique Audio


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