HoRNet Valvola

Its good plugin. Emulation might not be perfect replica of tube, but there is definitely musical use for that. You can choose from 7 tubes and can do negative effect as well and this is good for cleaning signal. There is output gain setting, no wet/dry mix.

It can saturate signal and can give it buzzing over drive sound. With right setup it will do just a bit every now and then and its better then overused vinyl emulation.