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TP143 25th September 2012 10:48 PM

Transformer Cases
 
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

Minion 26th September 2012 12:13 AM

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 .......

AJT 26th September 2012 12:28 AM

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...

TP143 26th September 2012 02:29 AM

I was referring to the metal box that houses the torroid, such as part CA-400 on the Antek site.

Thanks

Minion 26th September 2012 02:38 AM

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 ....

Einric 5th October 2012 11:06 PM

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.

frank1 7th October 2012 01:15 PM

Quote:

Originally Posted by TP143 (Post 3178962)
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

suntechnik 7th October 2012 01:23 PM

Morgan Jones writes about the subject in his book.


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