RCA tube manual link>>>[http://www.bunkerofdoom.com/tubes/rc25/]
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"I understand that the best tube is up to my subjective ear". Well no, not really. Just as you should not use a 5751 as a direct replacement for 12AX7 in all circuits, as it draws more current, you really should not change rectifiers will nilly as the electrical requirements are different. The preamp comes with a 5Z4P and the equivilent US or European tube is 5Y3 or GZ30. There may be other tubes that will work, but that depends on the circuit parameters, these are the direct electrical equivilents.