If you are specifically looking for more voltage drop out of a rectifier than what a GZ34 provides, then consider a 5U4GB or 5U4G. They spec at 50V and 44V of drop respectively.
A 5Y3GT does have a 60V drop, but it also restricts voltage and current considerably. Max current (PmA) from a GZ34 is 250 whereas a 5Y3GT is just 50% of that at 125.
I'd like to hear the Shuguang Black Treasure KT88s, but I doubt I will drop that much coin to try them out.
I've read rave reviews of the Sophia blue 6SN7 but they are so expensive. So few dealers carry them too.
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