thanks...
does the Base have like a maximum voltage to "Turn on" the collector - emitter connection?
From the physical point of view - there is nothing like a "turn-on voltage" between base and emitter.
The relation between the collector current and the controlling base-emitter voltage Vbe is an exponenetial function (Shockley equation):
Ic=Is*exp[(Vbe/Vt)-1] .
From this, you can see that there is a current Ic even for rather small voltages Vbe.
However, we have another situation if the transistor is used as a switch. In this case, we are considering only two distinct operational conditions: On (max. possible current) and Off (zero current).