Hi, I am planning to build some 9:1 Transformers described on Toms page at http://www.w8ji.com/beverages.htm using 73 mix binocular cores. My local supplier has a choice of two. 1. BN 73-202 with an AL of 8500 2. BN 73-2402 with an AL of 3750 Is there any reason why I should get the one and not the other? Thanks for your input! Carsten, DL6LAU