2 ways this can go. If the OEM cart was magnetic or ceramic cart.
1) ceramic has a high output. If you use it on a magnetic input stereo
it will blast you out if the room.
2) magnetics are very low output. Hook it to a ceramic input & you can
barely hear it at all.
SO the mag cart requires an extra amp stage that is NOT used for anything
else to work. BTW I have never seen a phono amp fail !
Try this. Unplug the audio cables from the turn table. Turn up the
stereo just a little & on phono. Touch the center pins & you should get
a loud hum. You are a free signal injector
73 Zeno
LFOD !