This might help:
http://www.nordicware.com/b2c/recipes_index.cfm?method=select&catid=4&recid=16&recipe=1
http://www.duncanhines.com/newDuncan/pub/featured-recipes/displayDH.asp?recipeID=393
http://www.duncanhines.com/newDuncan/pub/featured-recipes/displayDH.asp?recipeID=393
http://www.cakecentral.com/cake_recipe-2163-1-Darn-Good-Chocolate-Cake.html
I've found that I had the most success with getting the cakes to release by using pan grease and bread crumbs (yes, unflavored bread crumbs that come in a cardboard can).
You can make pan grease by mixing together equal parts (1:1:1) of Crisco, vegetable oil and flour. Doesn't require refrigeration and works as well as Wilton pan release.
You'll have to adjust your baking times, less than an 8" pan, but longer than cupcakes.
If you have directions with your tube pans, use that as a starting point.
HTH
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