$300 for a non-certified voltage regulator? Flying / maintaining airplanes is getting expensive...
 
I replaced my voltage regulator with a $20 one from eBay.
Search for AM101406 or MIA881279. Mine now has 189 hours on it.
The secret to long regulator life is to keep it cool by mounting it with heat conductive paste and using an air blast tube.
Mine will never fail because it knows that I carry a spare. :)
The B&C unit has great features like over-voltage protection and adjustable voltage.
 

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