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I haven't had many problems with bad resistors in this age of set, but I would check all of the voltages at each element of each tube...problems I have seen with resistors often relate to those which have been damaged by overloads due to bad bypass capacitors like at a screen grid. The voltage check will lead you to the bad resistors if there are any because you will have an off value or no voltage.
The RF generator has been such a help to me with problems such as this.
One helpful thing is that you can make the signal very strong and this can help get a signal through a misaligned set so you can align it. have seen several cases where an alignment needed to be done to pick up any stations and I think it was just due to component aging.
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