How to lower noise floor through mods?

Before you sign on for expensive mods, why not start with some Vibrapod cones and isolators. I use Vibrapods under much of my gear, and I just put a special arrangement of Vibrapods under my turntable which has catapulted its performance to the next level.

For as little as $56 and no shop time, you could find out how far the Vibrapods take you where you want to go. See here and here.

Disclaimer: I have no financial interest in Vibrapod; I've been an enthusiastic customer for over a dozen years, and they sometimes still surprise me.

Tubes that are tested for low noise might be the place to start. This would be a "plug and play" mod requiring only the effort to locate and purchase the tubes. But that romance and euphony might just be a product of noisy/micro phonic tubes. You won't know until you try.

Both caps and resistors will likely increase resolution and lower perceived noise floor. Retaining the tonal balance with these upgrades is a delicate balancing act. Most caps I've dealt with increase brightness to some degree, usually this can be adjusted for elsewhere in the system.

Modding power supplies may be helpful as well, particularly with the transients. I'm upgrading my Cayin's phono pre bridge rectifiers with HEXFRED's and bypassing the electrolytic caps with film caps next week, should have some answers soon. I'm looking for increased transient behavior, specifically more slam.

If you do go the modding route, just remember you can always undo the changes. I've also found modding to be the most interesting aspect of this hobby, really amazing sonic upgrades here! Endlessly replacing components is way too costly and relatively boring.

Mods are the way to go if you have some guts and soldering skills! Practice on cheaper pieces, gradually working your way up to more expensive components.