Looking for a well matched Preamp. Pls advise!

this might be a good choice, read the details about it's included optional phono board's settings

https://www.canuckaudiomart.com/details/650283120-vtl-25-all-tube-preamp-with-mm-and-mc-board/

I agree with @fatdaddy2  Although I haven’t heard that TT, I wouldn’t spend anything like $2000 on a preamp - unless you intend to replace the Victrola with a higher end TT soon. Then you need to consider whether you’d be going AN MC or MM cartridge. But that’s another discussion. Not sure if the Victrola has a built in phono stage. If so, you currently don’t need a pre with one included. In that case, $800 for something like the Schiit Kara would be as much as I would invest. 

line level preamp out to sub line in; sub high pass line level out to amp, that gives both the amp and the speakers a break, neither try to make low bass.

that sub, line out is to a second sub I believe, you need to read it's manual

What Marantz are you using?  I disagree completely that it’s not worthwhile to upgrade your preamp.  A preamp is critical, and a good dedicated stereo preamp will greatly improve overall system performance whether you’re using your turntable or DAC especially if you’re currently using a mass market AVR. 

@soix   Thanks. Marantz SR7005.