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			| Re: custom parafeed transformer wider [message #75566 is a reply to message #75558] | Tue, 19 February 2013 19:29  |  
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					|  Thermionic Messages: 208
 Registered: May 2009
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	| I don't know of anyone who builds with amorphous cobalt/nickel alloy specifically, as that sounds like a rather exotic material indeed. However, MagneQuest, Lundahl and Intact Audio (Dave Slagle) offer both cobalt and high nickel content Permalloy cores. 
 I can tell you from experience that MaqneQuest's EXO line of parafeed OPTs sound very nice, and are available with cobalt cores. The icing on the cake would be a silver-wound secondary, if they offer silver as an option and you can spend the requisite Mt. Everest size pile of cash. I know Lundahl and Electra Print do offer optional silver windings, but Electra Print will only build parafeed OPTs with M6 cores, which leaves you with Lundahl.
 
 Thermionic
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