I have seen the ET Seduction, and those guys are the King's of Thin. Different tubes? 2x 8532's? Little bit more gain is always good...:-) The 6DJ8 is quite attractive, but really good ones are 'spensive.

I can see plenty of ways to complicate it! L-C filaments, Tube rectified, L-C for B+. Shunt regs...Yamamoto sockets. Super 'spensive RCA jacks. Not quite sure one should abandon the L-C filters.
cheers,
Douglas