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Having a schematic would be a big help to you. The first thing to do is make sure that the horizontal output stage is getting B+ voltage. In the newer vertical chassis sets, there is a big 10 watt wirewound resistor that will open and kill the HV. I believe the older flat chassis sets like this one have the same resistor. If there is B+ voltage, check that the horizontal driver module is producing a drive signal and receiving the porper B+ voltage. Also, check the horizontal driver transformer that couples the drive signal from the horizontal driver module to the base of the horizontal output transistor. I have seen these transformers open. If all the above is good, carefully unsolder the lead from the tripler that goes back to the flyback transformer. With this lead moved so it can't arc to the chassis, power up the set and see if you can draw an arc from the lead to a screwdriver. If you get an arc; but, have no HV at the CRT second anode, you have a bad HV tripler. When these triplers fail, they generally either arc/burn or short and blow the fuse/trip the circuit breaker. In some cases, they can fail silently and kill the HV. Be careful in that if the tripler shorts and the TV is left on, the flyback transformer and horizontal output transistor will be ruined. I've seen it happen many times on the vertical chassis sets on once or twice on the sets like what you have.
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