[Jukebox-list] Question

Hello all, I have an AMI G-80 and I recently replaced the original stylus with a new one. However, even before the change some records particularly mid to late 70's record as well as 80's records play at a low audio output. I have found some of these records do not play at the same audio strength as 50's and 60's records. Ami I doing something wrong or has anyone else noticed this with an older jukebox? Please give me your thoughts. Thank you

Jamie