Again if you records sound like "Rice Krispies" get new ones!LOL,, I got a number of claims of members having "no rice krispies" but no one tried to deny having (off center records, wow & flutter, warped records, records that change resolution from outer to inner grooves cause every single one ever made does, mono bass, and all the rest.
Guys, feel free to enjoy playing your records as much as you like, they can be fun to experience along with a black and white movie. Just please snap out of these claims of vinyl & tubes sounding "better". Better would always be closer to the sound of the master tape. For any number of reasons you may enjoy listening to these obsolete technologies, but they are vastly inferior to modern digital and solid state reproduction.
It's almost Christmas and I used to enjoy going to downtown Chicago and taking a horse and carriage ride around Michigan Ave and the sales district, but I wouldn't want to give up having a new C8 Corvette for it. LOL.
As to DR Expanders, Back in the day I ran a Phase Linear 1000 Autocorrelator Noise Reduction System. Although not useful for rice krispies it did an excellent job of improving DR, removing surface noise and low freq rumble.
I understand there are some modern designs that offer much improved performance.
There is no dynamic range left at all on many CD's, not a format problem but a production/mastering one. Another thing to consider is that the frequency response of CD's is brickwalled at 22.05Khz, no such limitation with LP's, whether or not it is audible don't try to say that CD's are superior to LP's in every way. If it sounds better, it is better.