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EI or double-C core for class A Amp?
EI or double-C core for class A Amp?
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Old 6th October 2012, 04:54 PM   #1
jeepy is offline jeepy  Switzerland
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Join Date: Feb 2010
Default EI or double-C core for class A Amp?

Hi All,
I asked some companies for custom transformers and the price for double -C is significantly higher compared to EI core even if they are a bit smaller in size. Is there any benefit using the more expensive ones for class A amplifiers? I am assuming that unlike for class AB amps, the current trough the windings is almost constant. On top of that, the Pi filter CRC or ClC 0.2 to 0.4F total capacitance. I do not want use toroids for this application and I can't have custom R-core ¨made for my application.
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Old 6th October 2012, 05:55 PM   #2
jcx is offline jcx  United States
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Join Date: Feb 2003
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for a capacitor input supply the mains transformer current is narrow spikes at the rectified line V peaks, many times the average load current to recharge the caps

a large choke can smooth the peak transformer current - but typically has to be similar physical size to the transformer to store enough energy in its mag field
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