I'm also planning to pair my 103R with the Lundahl LL1931 SUT in 1:16 mode. Did you end up adding a secondary load resistor? If so, what value did you like best? If I've got my math right, 47000 / 256 (square of turns ratio of 16) = 183.6 ohms that the cart will "see", which is maybe a tad high since based on my understanding the target should be 140 (10x the 14ohm source impedance of the 103R)... but that should still be kinda-sorta in the butter zone even without an extra resistor... right? Or am I totally off base here?