Original poster: Kreso Bukvic <kreso.bukvic-at-kc.htnet.hr> Tommorow i go to a man that will make me a sphere! What is the best performance sphere i could use for 10 kv 50 mA system ( 500 watt)? Secondary is 4 inch 1000 turns of 0.5 diameter wire i have 8 primary turns i cannot put more because of the support and cap will be LTR?