Corey Bailey
Audio Engineering
USEFUL INFORMATION
Record Flattening
This article is a work in progress because I'm still experimenting.
You need to know the composition of the record because it will affect the flatting
process. Is the record laminated?
Here's what I've learned so far;
Place the record between two sheets of plate glass, at least ¼” thick, or any
completely flat surface. I use various sizes of ceramic tiles that I obtained from a
‘big box’ store and I place the smooth sides towards the record. Cut a couple
pieces of soft material the same size as the flattening plates to protect the
grooves. I use the thin cardboard that I obtained from the boxes that are used for
clothing presents. Use anything that will protect the grooves. If you use an old
piece of cloth or felt, make sure that there no seams. Clamp the sides using hand
operated spring clamps, one or two to each side. The strength of the spring
clamps will determine how long the process will take. I sometimes place the whole
assembly in the sun for about 10 minutes or less per side and watch the process
carefully. If you plan to place them in the sun, be careful!!
Putting additional weight on the record can cause the peaks between the grooves
to flatten out somewhat and cause distortion during playback. Heat can cause the
composition of the record to soften considerably.
Vinyl wants to return to it's original shape (or state) when heated and can cause
all sorts of problems.
I’m of the 'less is more' school when it involves flattening records.
Be patient! This process usually takes weeks or months & check the progress
often. If a record is unplayable, then all bets are off.
If you have any suggestions or questions, please contact me.
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