Stereo Filter SKF-K1 (Shruthi/Phoenix)

Hi, all!
I but together the SKF-K1 Stereo Filter - I got to high (+) plus values when measuring the voltage, (-) minus values were good. So I changed the L7805CV - regulator (+5v). So now the +5v values are good but the -5v are gone. What am i doning wrong? Did I damage the L7905CV (-5v) somehow?
Best,
/D.