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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Very Interesting Stuff posted by rober on April 29, 2007 at 14:49:10:
Steel will pick the magnetic field induced by the power transformer and the output transformer if you are building a tube amp. With a power amp I do not feel that RFI is so important as the input signal has been amplified quite a bit already (unless you are building a digital class D amp, of course!).
A copper sheet or even copper foil bonded to the steel chassis in the area immediately surrounding the power transformer will significantly reduce the resistance to the eddy currents generated by magnetic induction. As an example, Counterpoint used steel chassis but copper plated them for the same reason. I have several examples of vintage HK and Pilot products , again with copper plated chassis' for the same reason.
In this case you are not really trying to reduce the RFI and the EMI is the magnetic component which is really creating an issue (I know, I know, the purists will point out that you can not separate current flow and magnetism!).
Careful attention to the orientation of the transformer plates, a bit of isolation from the chassis itself (say, lifting the transformer about1/8 to 1/4 inch above the surface and shock mounting the transformer) will help a lot. Even aluminum is conductive and will suffer a bit from the eddy currents generated.Good luck on your project,
Stu
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Follow Ups
- Re: Very Interesting Stuff - unclestu52 15:33:47 04/29/07 (0)
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