Re: [ARSCLIST] Delamination on Aluminum base laquer disc

[Graham Newton <gn@xxxxxxxxxxxxxxxxxxxxx>]

John Loy wrote:

> Does anyone have any suggestions for playing back delaminating Laquer 
> discs? The pieces are shrinking. These gaps are so big they  actually 
> send the stylus flying off the cartridge.

I have experimented with making a wax bridge to fill the gaping trench to the 
height of the land, then scribing a groove by hand to connect the grooves of 
the two lacquer pieces using dental tools under a stereo zoom microscope.  Wax 
can also be used to hold down any broken pieces of lacquer to the aluminum 
base.  Gently warming it allows the piece to be properly repositioned if you 
don't get it right the first time.

The whole idea is to get the disc into a state where it can be played into a 
workstation where the noise created by passing the gaps can be edited or 
compensated for using processes like CEDAR's De-thump or Retouch available in 
the SADIE workstation.

It is VERY time consuming and tedious, and only practical if the material on 
the disc is sufficiently important to expend the time to do so, but it will work.

I suspect the solvent and fume cupboard approach of FilmSoundAustralia may 
produce better results and yield something that may be easier to work with, 
although it may risk the artifact if inexperienced hands are doing the work.



... Graham Newton

--
Audio Restoration by Graham Newton, http://www.audio-restoration.com
World class professional services applied to tape or phonograph records for
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