XPost: rec.audio.pro   
   From: hankvc@blackhole.lostwells.net   
      
   About a month ago I posted some questions about setting up a system to   
   digitize analog audio from several 50-60 year old sources.  One of the   
   suggestions for phonograph records was to use a Burwen TNE 7000 in the   
   analog line to reduce clicks and noise.   
      
   I was able to locate one of these at a place in Mass. that buys and   
   refurbishes these units.  It arrived about a week ago.  But I am not   
   getting results from trying to use---indeed, it only makes things   
   worse.  I'm not sure I've got the drill down on how to use it.   
      
   My basic setup uses a Tandberg 3008A preamp.  Phono cartridge (Stanton   
   681 EEE Mk II) to the preamp phono in.  Preamp variable out to the   
   digitizing computer line in, and one tape line out to a monitor amp for   
   direct monitoring.  Computer line out goes to a line level tape input on   
   the monitor amp, so I can easily monitor either directly or through   
   the digitizing computer.  All of that works well.   
      
   I put the TNE in the system by moving the phone cartridge out to the   
   TNE input, and connected the TNE output to a line-level input on the   
   preamp.  Tape in and out jacks on the TNE are unused.   
      
   My understanding of the TNE operation is:   
   1. Both Sensitivity and Threshold controls counterclockwise, Defeat   
   and Tape buttons out.   
      
   2. With a record playing, advance Sensitivity until the left LED   
   extinguishes.  That part works OK.  I don't hear any change in the sound   
   through the monitors when I do that.  Set point is about midpoint in   
   the knob range.   
      
   3. Advance Threshold until the right LED flickers on clicks.  That   
   isn't happening.  I can hear the click sound change as I advance the   
   control, but the LED doesn't light at all.  The click sound appears   
   sonically to change from high-frequency spikes to broadened low   
   frequency thunks, and if I advance the control a bit more, I now get   
   definite thunks for clicks that were almost inaudible.  In short, it   
   sounds as thought I'm getting oscillations rather than blanking.   
      
   So, what am I doing wrong here.  Or did this unit show up here with   
   problems.  It's doing absolutely nothing to improve the analog signal,   
   just making a bad thing worse.   
      
   Hank   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)