I have a VTL Ultimate Pre amp (circa late 80’s). Their is a phono interconnect marked on back and a separate interconnects jack marked MC. I highly recommend a high output MC,my VTL is quite noisy with low output MC.
https://photos.app.goo.gl/XSR4rHkbwAYYz1b5A
Click on link.
Open pre amp,you see the 2 two blue squares with on and numbers? One for each channel. I have it on for MC. The numbers are the load and ohm settings. It’s set for 100ohms.