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By replacing the 5U4 with solid state rectifiers, you are lowering the foward resistance of the recitifiers. This raises the B+ voltage, placing not designed for strain on old components.
If you must replace the 5U4s, at least add series resistance to bring the B+ back in line. Otherwise, your restoration may not last long.
As far as I am concerned, 5U4s are common enough that I leave them in. Also, these do not tend to fail shorted as solid state diodes do.
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