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In Reply to: RE: Vinyl Flat & Groovy Pouch, initial results posted by firstname.lastname@example.org on July 15, 2020 at 10:41:24
Yours may be more sever than any of mine so I need to give it a try too.
My worst have what I call a lip curl, meaning the outer edge has a flip, like it sat under excessive vertical weight. But a few others with a large bow affecting half the record as well.
Is there a directory of terms for describing different types of warps?
"The only cats worth anything are the cats who take chances. Sometimes I play things I never heard myself." Thelonious Monk
I know the sort you mean - those are tricky to flatten without introducing small ripple in the playing area. Lip curl? Potato chip? I think of Pringles....
Intuitively you would start with the lip sticking up and use the top platten to force the lip down. I prefer to start in reverse. You can certainly start that way, keep the heating phase within 4 hours or so. Then flip the record over for a second cycle - that should be enough to flatten it out almost perfectly. If the disc overheats (as some of mine did), the disc appears to have deformed such that where the lip was the cartridge jerks outwards at that point and you will hear a background "hash". Hence why I suggest being more conservative with time and doing several goes rather than one intense cycle which risks heat damage.
"Beauty is Truth, Truth Beauty.." Keats
Working on Bob Marley "Rastaman Vibration", which got warped along with the Stones LP from sitting inside my car 40 years ago. Bad edge warp rendering tracks A1 and B1 unplayable.
First cook at 60 minutes - very slight improvement. Can play one side without skipping, other side skips and is still unplayable.
Second cook at 80 minutes. Some improvement, but still getting skipping on the worst side.
Now started third cook set for 105 minutes. Will cool down later tonight and evaluate. Really hope to save this record. If I can just get tracks A1 and B1 to play without skipping I'll be a happy camper. The record was bought new so many years ago and is essentially NM but for the warp.
My Bob Marley record was baked for 105 minutes on the third round and that definitely worked. 95% of the warp is out, the disc is nearly flat and it plays beautifully. A very faint 'whoosh' on the brief intro to tracks A1 and B1 is aubible but otherwise it's returned to the NM condition it was in prior to getting warped. Two thumbs up for Vinyl Flat so far. Forty some years later and I'm finally playing this album and loving it!
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