This high voltage power supply uses a Half Bridge with IGBTs from previous supply 4kV~ 2000W. Two high voltage transformers from black and white TV sets are connected to it, with secondaries against each other. Original primaries of these transformers are removed and replaced with 27 turns of RF cable of 1mm diameter. Instead, triple wire of diameter of about 0.4 to 0.5 mm can be used. The transformers do not need no current limiting, because primaries are placed on the opposite side of the core than secondaries and thus there's a high leakage inductance. The power of each transformer is limited to about 750VA. The secondaries are oversized, The get only slightly warm. Operating frequency is about 20 to 25 kHz. With the number of primary turns may be slightly experimented, but should not be less than about 24 turns.