Yes, the 3.6 and tubes are not the best match. The 3.6 like beefy solid state amplification.
Thiel CS3.6 and PrimaLuna
I have a pair of Thiel CS3.6 speakers and a Primaluna Dialogue Premium HP Amplifier going thru a Mytek Brooklyn DAC/Pre. The sound is really good, but I know the Thiel's can do much better. I'm curious to see if folks would recommend going to a different amp (high current SS) or moving to a different set of speakers. Either option is viable, just curious to see what folks think.