Well, technically, John used an EL-34 loaded Marshall rack-mount power amp in conjunction with a Mesa/Boogie Triaxis only on "Metropolis Part I", so, with that in mind, it wouldn't be ridiculous to assume that a Stiletto Deuce II, which is essentially the same thing as the aforementioned setup (Mesa/Boogie preamp coupled with a power amp that's optimized for use with EL-34 tubes) would be able to come very close to at least the tone in that particular song.