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Hello, There is a sort of relationship between power and frequency, but only indirectly. This is because a TC of a certain power will tend to be of a certain size (within some range), and that size will tend to determine the frequency (again within some range). Still, TC's based on a 12/30 nst could be designed to run well on quite a wide range of frequencies. I came up with a set of formulas for designing a TC based on power input, but I can't remember them offhand. My TT-42 TC uses a robust 12/30 nst and gives 42" sparks. The specs are here: (however website might be not working) http://futuret.110mb.com A good TC design aid is Bart's "JavaTC" classic program which you can find using Google search. John -----Original Message----- From: shane bounds <57ovalbug@xxxxxxxxx> To: tesla <tesla@xxxxxxxxxx> Sent: Sat, Dec 14, 2013 9:11 am Subject: [TCML] Is there an ideal frequency you should build around? Hi, I'm building my first Tesla coil and was wondering if there is a certain frequency you should try to reach with respect to the power of your transformer? I found one formula, but I'm not sure about it,kHz= 3032.5xw^ -2767 - 96.4, not sure what the ^ is or if the formulas accurate. I've got a 12kv 30 mA nst giving me 360 watts. I'm building it on paper first and trying to get a good understanding of it and at the moment my secondary will have a frequency of 322.6 kHz _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla