source for obsolete trans?

[R.G. Keen]

>I am looking at some old schematics and they are filled with transistors 
>that I can't find in Mouser, Digikey, Allied, Elextronics express...
>
>where can these be found? any suggestions?
...
>
>should I just use modern replacements?
Unless they are used for some special purpose - temp/gain matching, 
unique VCA devices, etc., use the modern replacements. There are
doggone few applications that can't be served by the 2N5088 and
2N4250. There are some, but few.