From: tony.miklos@gmail.com   
      
   Doghouse Riley wrote:   
   > I've no idea if mine works on either of my Rockolas, but the volume   
   > level seems to keep the same on records except for a couple of EPs I've   
   > got which seem quieter. Could that be because the grooves in the record   
   > are narrower so the stylus doesn't vibrate as much...Or are the AVCs   
   > US?   
      
   Sometimes you can test the AVC by lifting the tone arm for a few   
   seconds, then setting it down on a loud part of the record.  You can   
   normally hear it loud, then as the AVC kicks in it mutes it somewhat.   
   (that's real easy in the shop with a square wave input and a scope on   
   the output)  It's not a perfect system, if the artist wants a certain   
   part of the song to be much louder, the AVC attempts to cancel that out.   
     It doesn't completely but it tries.  I think Rock-Ola's from late   
   60's- early 70's had a problem with the AVC where as it was placing the   
   record on the turntable it sensed no sound so it turned up the volume.   
   Then the first couple seconds of the record was often noticeably louder.   
      
   Seeburg had a better setup, combining the mute with the AVC.  During   
   record change it is muted, then as soon as the record is clamped on the   
   turntable, the mute goes off and the volume starts rising, usually good   
   timing with the tone arm in the records feed in groove and the AVC is   
   near it's mid point when the music actually starts.   
      
   Tony   
      
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