No. Not necessarily. It depends on everything - circuit, quality of transformers, type of tube, configuration of tube, quality of passive components. Adding tubes is not a panacea for some "tube sound."
Nuvista Tubes - General
May I have opinions please on the pluses and minuses of Nuvista tubes versus vacuum tubes? Supposedly and from the basic homework I've done, Nuvista tubes purportedly offer high reliability, low microphony, low noise, consistency, and small size compared to their vacuum counterparts. So what's the down side?