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 Post subject: Fixing Broken Berliner Disc - Piece Missing
PostPosted: Wed Sep 13, 2017 3:56 pm 
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Victor II
Joined: Thu May 26, 2016 3:46 pm
Posts: 283
Location: Philadelphia, PA
Over the past several months, a few generous collectors have loaned me their 7" Berliners. Most have been in nice condition but a local collector recently loaned me some, a few of which were damaged. The rim chips and needle drops have become very easy to fix, but this one is literally missing a ~¼" triangle.

Obviously I intend to repair this, here's how...
Clean and mold the disc.
Create two copies.
Clean up the broken edges on copy #1 and create a template of the missing piece.
Cut a piece out of copy #2 from either just before or after the missing piece.
Fit the piece under magnification.
Glue the piece in place.
Create a new mold and produce playable copies.

If the missing piece is ¼" and is out the outside edge then...
7" x 3.14 = 22" (circumference of disc at outside edge).
78rpm x 22" = 1,700" per minute, divide by 60 = 28" per second.
.25" divided by 28" per second = .009 seconds.
I wonder if a repeat of sound lasting only .009 seconds approximately every ¾ of a second will sound disruptive?


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IMG_4060.JPG
IMG_4060.JPG [ 247.1 KiB | Viewed 544 times ]
The Berliner Archive Project:
Lend me your Berliners to be molded and get your originals back plus free copies!
See the current status here = http://forum.talkingmachine.info/viewtopic.php?f=3&t=32545
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 Post subject: Re: Fixing Broken Berliner Disc - Piece Missing
PostPosted: Wed Sep 13, 2017 4:02 pm 
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Auxetophone
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Joined: Wed Jan 14, 2009 6:01 am
Posts: 2018
Location: Ferndale, MI
If it proves to be too disruptive you could always "destroy" the recorded sound in the grooves on the replacement piece so the music would just cut out instead of repeating.
Brandon


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 Post subject: Re: Fixing Broken Berliner Disc - Piece Missing
PostPosted: Wed Sep 13, 2017 4:05 pm 
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Victor II
Joined: Thu May 26, 2016 3:46 pm
Posts: 283
Location: Philadelphia, PA
A white noise area could be created by filling the void with wax and carefully etching in new grooves (under magnification). Using the area just before or after will hopefully create a better sounding repair.
The Berliner Archive Project:
Lend me your Berliners to be molded and get your originals back plus free copies!
See the current status here = http://forum.talkingmachine.info/viewtopic.php?f=3&t=32545


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 Post subject: Re: Fixing Broken Berliner Disc - Piece Missing
PostPosted: Fri Sep 15, 2017 8:53 pm 
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Victor II
Joined: Thu May 26, 2016 3:46 pm
Posts: 283
Location: Philadelphia, PA
Here's a little progress. The two copies came out nice and I was able to cut and fit a piece onto one of the copies.


Attachments:
IMG_4064.JPG
IMG_4064.JPG [ 1.56 MiB | Viewed 376 times ]
IMG_4063.JPG
IMG_4063.JPG [ 1.77 MiB | Viewed 376 times ]
IMG_4061.JPG
IMG_4061.JPG [ 1.84 MiB | Viewed 376 times ]
The Berliner Archive Project:
Lend me your Berliners to be molded and get your originals back plus free copies!
See the current status here = http://forum.talkingmachine.info/viewtopic.php?f=3&t=32545
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 Post subject: Re: Fixing Broken Berliner Disc - Piece Missing
PostPosted: Sun Sep 17, 2017 8:19 pm 
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Victor II
Joined: Thu May 26, 2016 3:46 pm
Posts: 283
Location: Philadelphia, PA
For a first attempt, I'm pretty pleased with how well this repair went. Here's a video showing the original and the repaired copies side by side, and the repaired section being played acoustically...

https://youtu.be/JNq2rNNCxV8
The Berliner Archive Project:
Lend me your Berliners to be molded and get your originals back plus free copies!
See the current status here = http://forum.talkingmachine.info/viewtopic.php?f=3&t=32545


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 Post subject: Re: Fixing Broken Berliner Disc - Piece Missing
PostPosted: Mon Sep 18, 2017 1:56 am 
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Victor V
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Needle Tins are Addictive
Joined: Fri Jul 09, 2010 8:32 pm
Posts: 2822
Location: Belmont, North Carolina
That turned out surprisingly good... Berliner records are noisy anyway, so you don't really notice the flaw. The video after this one shows a repaired cylinder... is that the one you glued back together with WeldBond glue? Good save...
"The phonograph† is not of any commercial value."
Thomas Alva Edison - Comment to his assistant, Samuel Insull.

"No one needs a Victrola XX, a Perfected Graphophone Type G, or whatever you call those noisy things."
My Wife


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 Post subject: Re: Fixing Broken Berliner Disc - Piece Missing
PostPosted: Wed Oct 18, 2017 2:42 pm 
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Victor II
Joined: Thu May 26, 2016 3:46 pm
Posts: 283
Location: Philadelphia, PA
Yup. Weldbond works really well for repairing discs. Filling in cracks with candle wax also works well for playing electrically, or to use prior to molding and copying the disc...
The Berliner Archive Project:
Lend me your Berliners to be molded and get your originals back plus free copies!
See the current status here = http://forum.talkingmachine.info/viewtopic.php?f=3&t=32545


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 Post subject: Re: Fixing Broken Berliner Disc - Piece Missing
PostPosted: Wed Oct 18, 2017 3:11 pm 
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Victor IV
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Joined: Mon Jul 25, 2011 8:27 am
Posts: 1756
Location: Blairstown, New Jersey 07825
HisMastersVoice wrote:
If it proves to be too disruptive you could always "destroy" the recorded sound in the grooves on the replacement piece so the music would just cut out instead of repeating.


Like an 8-Track tape :lol: :lol:


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