Why do Tube Amps sound more romantic v SS amps

They sound different because they are electrically different.This provides an excellent explanation of those differences.

http://education.lenardaudio.com/en/12_amps_8.html

Yes , and you will never be able to duplicate the sound of something like a 2a3 or 300b with silicon.   

Class A SS can be just as ‘romantic’ as 2A3 or 300B driven electronics. Not all electronics (pre or amp) with tubes are romantic sounding. The key is implementation and designers pedigree in both topologies.

That is true.   Yeas ago I tried a Pass Aleph 3 and it sounded awesome.   My speakers were a poor match     Plus it ran hot as hell so at the time it wasn’t for me.  
 

It was purple colored it got so hot.   

Agree with @jtgofish 

Tube and SS are very different in amplifier way, so that let us understand the sound is that different. 

For me, I either go SS or go tube.

I do not want to mix different things together in one system.

I feel so happy with the tube sound, and I can continue listening over 8 hours a day.