Top quality vintage tube gear has a sweet, musical tone which newer stuff doesn’t quite deliver. But for unhindered bass slam in the lowest octaves, that’s best served by solid state.
My Marantz 7 preamp got the Pooge upgrades plus solid state power supply regulation. The sound sparkles. It is engaging and even seductive and it lost its slightly wooly sonic signature. My power amps are biamped; A Citation II with modern caps and Hexfreds in the power supply works above 400Hz and delivers the musical harmonics and the most fragile upper frequency details flawlessly. For the bass, a Carver 2.0 pro amp delivers effortless energy to a pair of custom speakers made from Boxer components formerly at the Hit Factory.
And for all these parts to sound their best, I use interconnects that don’t get in the way: Pure solid core silver unshielded Silver Solids.