I just got batteries to test my self oscilating circuit with but something strange happened.

After about 15 mins or so my capacitor began to overheat on the charging side. It's a 450v 3.3 uf capacitor so it should be set properly and be well within range for the unit. I'm using a Neon bulb to trigger the scr so the voltage never gets much above 55 volts in the cap.

Any one have any idea how to keep this from happening?