You can use the 6 pin tubes. Pins 1 and 6 are not used for anything, so it doesn't matter.
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Plato, really a draw depending on what you value in your listening
experience and what ancillary equipment (tubes, cable, interconnect, DAC
and so forth)...but pushed to the wall I'd pick the NOS Reflector 6n3ce
(6L6) as my all-around choice. I also used KT66 with great success.
I can't answer your question about the 5881, never used them in this
application. I'd call Cary and ask. Perhaps someone else on 'Gon can