If you have a meter with a diode test, then you would test the HOT with the black lead on the center leg and the red lead on both of the outer legs. You should get a reading between .400-.700 on both if it's good. Anything lower is bad. You will get a zero (short) reading if you try to measure between the outer two legs, but that is a false reading thru a low-value part. If you test it out of circuit in diode test, you will find that between the outer legs will measure about .087 on a good transistor, and between .400-.700 with the black on the center leg and the red on both of the outer legs.
I don't see a lot of blown fuses with bad HOTs though. Typically if the fuse blows, then you usually have a short in IC4, C38, C36, D18, or maybe even an arcing flyback.
Make sure that the ground wire from the tube to the neckboard is connected. If not, the chassis will spark to the frame and that will blow your fuse - as well as other parts....