Really, Jenny, that is most interesting. An excellent example of lateral thinking, I think. Infinitely better than giving the machine a kick, although even that might do the trick!
If all else fails, a brief dunking in a hot bubble-bath should teach the recorder a lesson! But do be sure to disconnect the machine from the mains supply before attempting this.
Seriously, shazzabell, you may think your machine is fine but something caused that tape to jam, and I believe that usually involves the tape somehow getting 'caught' and wrapping itself around a spindle or some other component. It could be that your old tape had a sticky spot. Either way, there is now a likelihood that the same thing could happen again, so if you treasure your tapes/recordings, I suggest that you at least use a head cleaner tape (which cleans more than just the heads) a couple of times. If your machine is fairly old, and you have treasured recordings, it might be better to ditch it for a new machine.