Thanks Ethan, I knew I could count on you!  
Please excuse my naivety on this topic, but I take it that 468, 911, and 900 are +3, +6, and +9 tapes, respectively; so for comparison purposes, if my deck operating level is 250 nW/m, I should be recording 486 at 0 Vu, and 911 at +3 Vu, all other...