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The 5U4 could be bad, or it might just be the surge of turning it on putting a strain on it, some 5U4's will short if laid on their side in the wrong direction.
Do you have a Variac? the best thing to do would be to bring it up slowly and see what happens, if the 5U4 gets really hot really fast then something's shorted.
An alternative to a Variac is to power it up through a light bulb, a 100 watt bulb wired is series with the set should come on bright then dim way down if everything is OK, a 200 watt bulb will probably be enough to fire the oscillators and check for HV, 300 watts should be enough to light the screen.
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