Non-magnetic bolts that hold an output transformer together - diyAudio
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Old 21st October 2009, 10:34 PM   #1
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Default Non-magnetic bolts that hold an output transformer together

does it matter? I have these output transformers that I'm going to use for my Baby Huey PP EL84. They have ferrous (magnetic) bolts and no bushing.

I'd prefer them to be like my Magnequest Iron...i.e. nylon bushing and brass. I.e. non magnetic. So I'll be replacing them.

Do you care? Does it matter? And if it matters it probably matters very little?
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Old 21st October 2009, 10:46 PM   #2
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it matters - if they contact any of the laminations and form a magnetic path. For the very limited cost and hassle, I'd replace them
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Old 21st October 2009, 10:58 PM   #3
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I'm not the expert on this, but of all the many output transformers I've seen, I've never seen one that didn't have an insulating shoulder washer on at least one end. Either that or non magnetic bolts. There must be some reason for this because I keep thinking of a shaded pole motor. You know the kind that has a copper shunt around part of the pole piece. It's effecting the core's flux somehow. Special washers cost money and I don't think it's there to protect the paint.
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Old 22nd October 2009, 11:19 AM   #4
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Thanks for the replies guys. I would have changed them anyway because I would always be thinking...what if.


Quote:
if they contact any of the laminations and form a magnetic path
Well even if they don't touch the laminations, isn't it. Purely because they are magnetic.
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Old 22nd October 2009, 11:24 AM   #5
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Magnetic or not, they are metal in the magnetic path and will have a current induced in them.

If you want to try a real difference, try a nylon bolt

Cheers!
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Old 22nd October 2009, 11:53 AM   #6
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The nylon bushing is to insulate one end of the lamination stack from the other. If you don't put it in, you will create a path for currents to flow and heat up the transformer.
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Old 22nd October 2009, 01:28 PM   #7
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Quote:
Originally Posted by Bas Horneman View Post
. . .
Do you care? Does it matter? And if it matters it probably matters very little?
Please try before and after.

If you can honestly hear or measure something, I offer you a pair of mine design
(I speak about transformers, of course)

Thank in advance.

Yves.
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Old 22nd October 2009, 01:35 PM   #8
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Ok Yves..will try before and after. Damn now I have to go looking for the bolts and nuts I threw away last night.
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Old 22nd October 2009, 01:40 PM   #9
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Quote:
Originally Posted by Bas Horneman View Post
Ok Yves..will try before and after. Damn now I have to go looking for the bolts and nuts I threw away last night.


Don't cheat, use original ones
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Old 22nd October 2009, 03:45 PM   #10
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Nylon Bolts are easily found at the Big Box home centers (ie;Home Depot,Menards,Lowes,etc.) I am not sure of the amount of torque they can take. I might suggest using real Brass.

Brass bolts etc are available at the same places, make sure they are solid brass not plated steel, (I carry a small magnet in my pocket)
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