1. An apparatus for random access by an electron beam to analog data storage tracks, said apparatus comprising: target means having a recording of a plurality of spaced-apart storage tracks defining essentially permanent recordings of analog data; means developing an electron beam to scan along a storage track defined by said target means for producing an output electrical signal corresponding to the recordings of analog data; first control means to direct said electron beam onto only a selected one of said storage tracks defined by the target means; second control means to direct said electron beam along only the selected one of said storage tracks defined by the target means; means for oscillating said electron beam at a dither frequency having an amplitude corresponding essentially to the width of the selected one of said analog data storage tracks; and a digitally addressible control means coupled to said means for oscillating and said first and second control means to select and then scan along a storage track for producing an electrical signal corresponding to the recording of analog data, said digitally addressible control means enabling said first control means to direct said electron beam from track-to-track onto the selected one of said storage tracks, said digitally addressible control means further enabling said means for oscillating and said second control means to direct said electron beam along the storage track while the beam oscillates at the dither frequency and thereby scan the selected one of said storage tracks.
1. An apparatus for random access by an electron beam to analog data storage tracks, said apparatus comprising: target means having a recording of a plurality of spaced-apart storage tracks defining essentially permanent recordings of analog data; means developing an electron beam to scan along a storage track defined by said target means for producing an output electrical signal corresponding to the recordings of analog data; first control means to direct said electron beam onto only a selected one of said storage tracks defined by the target means; second control means to direct said electron beam along only the selected one of said storage tracks defined by the target means; means for oscillating said electron beam at a dither frequency having an amplitude corresponding essentially to the width of the selected one of said analog data storage tracks; and a digitally addressible control means coupled to said means for oscillating and said first and second control means to select and then scan along a storage track for producing an electrical signal corresponding to the recording of analog data, said digitally addressible control means enabling said first control means to direct said electron beam from track-to-track onto the selected one of said storage tracks, said digitally addressible control means further enabling said means for oscillating and said second control means to direct said electron beam along the storage track while the beam oscillates at the dither frequency and thereby scan the selected one of said storage tracks. 5. The apparatus according to claim 1 wherein said plurality of spaced-apart analog data storage tracks each comprise a variable width track lying below the surface of said target means and exposed to said electron beam.