RCA vs Phono cable

Thanks all, glad to hear the Synergistic Research cable will probably do well. Got the Graham Slee phono preamp this morning and hooked it up with an ancient Red/Black RCA cable and it sounds pretty good. Noticing a lot less snap, crackle and pop and better soundstage than I've ever heard with my vinyl before. Bass is solid and deep. Instructions say the Slee will be operating at its best in about a week. Hope to hear a bit more midrange. Since the Synergistic Research RCA cable is "used" hopefully there'll be little need (if any) for break in.

Another question, my Husband has about a dozen 78 rpm vinyls that were his grandmothers. If I purchased a 3 speed turntable would he need to change cartridges to listen to 78's versus 45's and 33's?

Last question, yes. As in don't try it with your non-78 stylus. I think you can get a 78 stylus for your cartridge.

PS. I’d spend a lot less on a cable than on a turntable and cartridge. In fact, you might try this cable if you don’t get a better mid-range with what you have.
https://www.ebay.com/itm/BELKIN-Pure-AV-High-Quality-Dual-RCA-Audio-Cable-AV20302-06ft-M-M-NEW/28113...

Usually a phono cable has low capacitance per foot as opposed to other audio cables...

How does low capacitance effect sound quality?