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rs1026 10th September 2004 11:18 AM

shielding a E-I transformer
If plan to house PS and the AMP in the same unit. How do I sheild a EI transformer.

Also wanted to know if sonics will be very bad if I use a EI transformer. As of now I wanted to test the setup with a EI transformer since I cannot afford a torodial.

Thanks in advance

Bas Horneman 10th September 2004 11:20 AM


Also wanted to know if sonics will be very bad if I use a EI transformer
Not at all will it sound bad. If you have a noisy mains environment it could be a better choice than a toroid.

rs1026 10th September 2004 11:27 AM

but how to shield
Thanks Bas, but any ideas how to sheild the transformer?

carlosfm 10th September 2004 11:44 AM

I use aluminium tape.

rs1026 10th September 2004 12:19 PM

aluminium tape??
Should I cover the transformer with aluminum tape ??

Bas Horneman 10th September 2004 12:25 PM


How do I sheild a EI transformer.
Depends...what do you want to shield it for.
a.) Shielding the circuitry from the magnetic fields?
b.) Shield the transformer from RFI.

In the first case you should get a pre formed mu-metal casing.

in case of b.)

You could use alu foil or special made copper foil from 3M.

The last option (b) won't necessarily give an improvement in sound..


carlmart 10th September 2004 12:39 PM

1) Amps using unshielded EI transformers may sound better with the transformer on a different metal box.

2) You may try using a steel plate to separate the supply area from the amp area.

3) You may also try mu-metal tape, but it won't be as effective as 1. Using 2 +3 may prove effective too.


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