some things i do for this effect are;
-emulate an unsteady motor by putting a pulsar on the master with 0 delay and 0 feedback. automate the main millisecond delay to get little pitch wobbles! the filter there is pretty useful too.
-tape often has tiny dips of volume from dust. you can fake that by splitting the left and right channel and occasionally muting and unmuting very quickly. you can hear that on loose threads specifically on the piano that plays at :50