The 75 ohms is the setting on the B&K 415 Signal cable, you can select 75 or 300
"fall in the correct place?" maybe not the best way to describe but as I adjust a coil the response curve on the scope moves right or left which has the effect of moving the marker up or down
- Linked below is a small video of adjusting the 41.25 coil above an below what to me is the peak which I assume is the minimum response
- https://imgur.com/VRn62J5
I agree on needing to bring it all together, I will follow up with where I am at in a bit.