Usually a bad ground, quite often on the little cable with the RCA plug.
If you don't know what an RCA plug looks like, do a google images
search. I forget if it only goes to the pulse amp or if it goes in and
out of a jack on the way.
I got into the machine today and found the whole selector unit loose.I
guess after 50+ years and moving, the unit become loose.I adjusted
it,checked the play.It seemed to be off 1 digit on a selection,so I
moved it a little the other direction and it plays fine.
I also cleaned the rca connection since it could have been an issue.
Thanks for replys.I appreciate them.
Tim