For a substrate called: Srctide with the sequence:
KVEKIGEGTYGVVY which belongs to the family Tyr Kinases. which residue represent the site of phosphorylation?

try the netphos prediction server
http://www.cbs.dtu.dk/services/NetPhos/

I'm glad I could help

CBS has other prediction servers as well:
http://www.cbs.dtu.dk/services/
(glycosylation, acetylation, signal peptides,...)

try out some of those as well

in the course of time I have found several prediction servers on the Internet (or different purposes)

if you need some, please just let me know