I put my vote on the Shift Line Olympic Tube Preamp.
It’s a great unit and sounds really awesome. It does the pushed tube amp unbelievably good but it doesn’t do overdriven sounds. It’s the best “clean” preamp I’ve ever tried, and I own a bunch. Le Bass, Tonehammer, SCR-DI, Vintage Ultra & A/O, Hartke Bass Attack I &II, MXR M-80, 3Leaf the Enabler, Verellen Meatsmoke, Noble, Rusty box and probably a couple more.
It takes dirt really good and the cab sim, especially the 8x10, is fantastic. And the headphones is dead silent, perfect for silent practice. And the whole unit breathes quality. I wouldn’t hesitate buying another if something happened to this.