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I don't really see how replacing a 6X5 with diodes is "safer". the 6x5's don't short on their own (except maybe if damaged in shipping) But if a filter cap shorts and overloads them, they can fail and cause a short in the process, taking out a transformer. 5y3 and other directly heated rectifiers would fail in that circumstance also, but they don't tend to short out when they do, acting as a kind of fuse. If you added a quick acting fuse, wouldn't that be safer? if a filter cap shorts with a SS rectifier you'll probably still harm the transformer before the diodes fry, plus without a dropping resistor the B+ would be higher than stock.
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