For my LCD2s in order of preference:
1. Russian gold grid Voskhods
Where the rest of my tubes didn't quite deliver a signature tube sound, these tubes provide it in spades. Cozy luscious mids, natural highs,` sufficient amounts of bass, making for a lovely analog sound - they're the perfect complement to the LCD2s. If Alo Audio really did design the Pan Am for the LCD2s, these should have been the stock tubes. Tube rolling is over for me.