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This sounds like it might be HV arcing. The HV filament leads to the rectifier or the anode lead to the CRT can arc to the chassis if the insulation has broken down or cracked. As a test, you can use a plastic insulator, such as a cassette case, to move the leads away from the chassis (with power disconnected and HV discharged) to see if the arcing stops. If you find that there was arcing, the ultimate solution is to replace the HV leads. Make sure you use appropriate safety precautions when dealing with the HV leads.
Also, it is not a good idea to jumper the fuse---where there is a dead short, more damage can be caused if there is no fuse protection. If you don't have the belfuse, wire in a fuse clip and put in a regular fuse (probably 1 amp would do.) I think that there are two fuses in this set in the B+ secondaries of the transformer, one is for the high b+ for the tubes and another is for the 24 volt supply for the transistors.
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