Are Tube Buffers for real or even worth it ?

Currently on one of my set ups I’m running a Carver TFM-35X amp through a Parasound ZPre3 Preamp to some Maggi .7’s.  Being I really prefer a tube sound I was wondering if I picked up a Tube Buffer for a few bucks and ran it from the output of the Parasound preamp to the input of the Carver TFF-35x amp would it tame the carver’s output to more of a warmer tube type sound out of the Maggi’s? Has anyone tried anything like this and been happy with the results? 

The Amp is a beast but just a tad Solid State sounding for my taste but kicks butt none the less. 

Any thoughts?