Any good reasons to use transistor phono stage and line level preamp instead of tube ?


Besides lower noise and no need to hunt for particular NOS tubes. 
inna
Anything a tube can do, a transistor can do the same thing - and never wear out!
There is no such thing as a "tube" sound or a "transistor" sound! Contrary to what the untutored believe!
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I have both tube (Manley Chinook, Jolida JD-9) and solid state (Musical Surroundings Nova Phonomena) phono pre-amps.  

The size of the units may be another factor to take into consideration. 

The Phonomena takes up less space than the other units, but on the other hand I can stack a turntable on top of the Jolida.  There are of course some very small tube units like the Project Tube Box and large solid state units. 

I leave my Jolida JD9 on most of the time by the way.

My space is limited and size and form always play into my decisions.