Best Way for my TT to reach my Pre-Amp!?

For the money, it’s hard to beat the Schiit Mani and Blue Jeans LC-1 low capacitance RCA cables, and will far exceed the built-in phono stage of your receiver. Been there, doing that.

Something you may want to consider is the iFi Micro iTube2 connected between your Marantz and Atoll amp. It will provide you some ‘tube magic’ no mater what your source is, including your phono stage. On a whim I picked one up used and placed it between my Yamaha receiver (which I also use as a processor/pre, not sure it could work the same with your 500 or not, as I only use my B&K for the 2 main channels) and ‘vintage’ B&K amp that powers my mains, and am quite happy with it. Quite an interesting piece of equipment, and seems to blow other tube buffer stages out of the water with its quality and options provided per those who have reviewed it compared to others, many that are more a gimmick than useful addition to a system.