A few words for the need for extreme caution are in order. A very high voltage source (10's of KV) producing even small amounts of current, 10's to 100's of uA can be DEADLY. This is way more voltage and current than is needed to start a heart fibulating. A cutoff switch to turn off the high voltage if the case is opened should be used. After the high voltage is turned off, some method of insuring that the high voltage is bled off should be used.
Also the high voltage power supplies in TV's produce positive voltages. This voltage is used to charge the anode at the screen end of the tube. It is used to accelerate the electrons emitted by the cathode (electron gun) at the end of the tube neck toward the screen. Reversing the current flow through the primary winding of the flyback transformer should do the trick, but the drive circuit (power transistor and its control voltage) will have to be changed to do so.
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