Not sure what you are trying to do; but I suspect you want to fire the circuit up and get some HV.
Sounds to me like you have not got the rest of the TV set to connect it to.
If so, be aware that the Horizontal output system is a resonant system and resonates at a certain frequency which is set to give the required flyback time of around 12 to 14 microseconds. part of the resonant circuit includes the deflection unit and the EHT system so by disconnecting the deflection unit and the EHT, you effectively detune the Horizontal output system. These systems have a primary resonant frequency to set the flyback (retrace) time of around 45 to 55 kHz, and the EHT system is 3rd or 5th harmonically tuned to the primary resonant frequency. The affect of detuning can result in the peak voltages across the main switch, exceeding the device spec (Q12308?)
So just be aware.
hope this helps.