The following site has a cross reference on line.
http://www.ecgproducts.com/
Believe STK005011 might be STK0050U.
Norm
:bon jour
:je cherche equivalent transistor 2sc756
:et stk0050ll
:et 2sd45
:mercie
2sc756 equivalent are manfuctured by NTE Electronics
It's TO-39 NPN AUDIO OUT Transistor NTE128 OR
TO-39 NPN 4W RF OUT Transistor NTE282
My favorite parts distributor MOUSER ELECTRONICS
Part # 526-NTE128 &
526-NTE282