New rogue sphinx or used rogue 99 preamp

I have PSB Image T5, connected to cambridge audio stream magic (using it as preamp as well) and parasound 275 power amp. While purchasing this a few months back, I had listened to rogue audio sphinx hybrid integrated amp and really liked it. Since this was my first purchase so I didn't wanted to stretch my budget and decided against sphinx.
Now after few months of listening I feel I need the sphinx. I can't explain the difference but it seemed more 3D, i guess its the tube effect.
As I get ready to spend the money on sphinx, I found that I can get used rogue audio 99 preamp at the same price as sphinx which if I can pair with parasound could be an option. I haven't heard 99 though.
The questions I have for you all,
1. Can I pair rogue audio 99 preamp with parasound 275?
2. Is it better to buy a new sphinx or pair a used 99 preamp with parasound 275?
Since i am not sure if the "better sound" of sphinx was because of tube preamp or the whole package. Will the 99 + parasound 275 sound better or parasound 275 is the weak link and sphinx alone is better?

Thanks in advance for your guidance