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Old 25th September 2012, 10:48 PM   #1
TP143 is offline TP143  United States
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Are transformer cases necessary? They claim to isolate the transformer from interference but they cost half the price of the transformer itself. Just curious if this money is better spent elsewhere.

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Old 26th September 2012, 12:13 AM   #2
Minion is offline Minion  Canada
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A transformer emitts a magnetic field that can cause noise in audio curcuits but you can generally mitigate this with carefull positioning of the transformer .......
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Old 26th September 2012, 12:28 AM   #3
TonyTecson is offline TonyTecson  Philippines
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end-bells are used mainly for mechanical protection of the transformer windings.....a box type traffo cover is better imho.....i assume you mean EI's, for torroids, it is not even necessary...
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Old 26th September 2012, 02:29 AM   #4
TP143 is offline TP143  United States
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I was referring to the metal box that houses the torroid, such as part CA-400 on the Antek site.

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Old 26th September 2012, 02:38 AM   #5
Minion is offline Minion  Canada
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Generally a torroid isn"t going to emmit a magnetic field into your audio curcuit unless your transformer is really close to your audio curcuit and is oriented in a way that points the EMI into your curcuit in which case you just change the orientation of the torroid ... a torroid has up to 8:1 reduction in magnetic field compared to an EI Transformer ....
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Old 5th October 2012, 11:06 PM   #6
Einric is offline Einric  United States
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I have thought about using a cover of some sort for my toroids just for aesthetic reasons.
Painted end bells look nice and having an open toroid might look funny next to nice EI cores.
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Old 7th October 2012, 01:15 PM   #7
frank1 is offline frank1  United Kingdom
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Quote:
Originally Posted by TP143 View Post
Are transformer cases necessary? They claim to isolate the transformer from interference but they cost half the price of the transformer itself. Just curious if this money is better spent elsewhere.

Thanks
I would say that in VERY critical, high gain, low level applications a mu-metal (magnetic) screening can would be useful.
In a power amp, no.
Don't forget, transformers do need cooling.
Frank
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Old 7th October 2012, 01:23 PM   #8
suntechnik is offline suntechnik  Russian Federation
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Morgan Jones writes about the subject in his book.
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