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Old 20th November 2009, 04:41 PM   #11
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Jacque Merde.... As a user id, clever...
Now we can say we *DO* know him...
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Old 20th November 2009, 05:08 PM   #12
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Originally Posted by Mario Pankov View Post
What I found so far is a material called Metglas Magnetic Alloy 2714 which shows superb qualitues - it has the lowest core loss -- To me it looks like the ideal core material, any thoughts?
Lundahl offers an amorphous core in their top transformers - see Lundahl Transformers, audio transformer and tube amplifier transformer manufacturer

Here is what they say about the difference with regular M6 cores of the same size:

"The obvious measurable difference between our silicon-iron cores and amorphous
cores is that the saturation flux for the amorphous core is approximately 33% less than
for the silicon-iron counterpart. This is caused partly by a lower saturating flux level,
partly by a smaller fill-factor due to the thickness of the amorphous sheets.
As a result, power bandwidth is reduced with about 50%. (This means that if the max
output power for a standard LL1620/40mA is 25W at 30 Hz, corresponding max.
power for LL1620AM/40mA is 13W.)"

I don't know what amorphous alloy they use - perhaps Per Lundahl will be willing to email you about it.

Best wishes.
Francois
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Old 21st November 2009, 01:21 AM   #13
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Originally Posted by Bandersnatch View Post
Now we can say we *DO* know him...
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Douglas
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