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In Reply to: RE: Uncurable warp posted by akolegov on February 06, 2016 at 08:47:41
Yes, it sounds like my infamous U.S. copy of Dwight Yoakam 'Just Looking for Hit'. It was severely warped (potato chip) on one side and flat on the other. That is hard to imagine but it happens with vinyl records. I put this LP on the Disc Flattener on numerous occasions back in 2005, it took probably 25 or more sessions before it flattened out. I played it last weekend and it is still flat. Shrink Wrap caused the warp in that case. It had been sealed in shrink wrap for over 10 years. It was an Ebay purchase.
It seems to me that the first four/five treatments do not yield very noticeable changes with some LPs( Japan and U.S. mostly), so you have to persist. You could maybe let a few days or a week go by before you put your LP in the Flattener again. Also, reverse sides every so often although you probably will find that you are getting better results with either Side 1 or Side 2 face down on the Flattener. I have had Japanese LPs that were slightly warped and four or five sessions on the Flattener produced no result. I put them away for a few weeks and tried again later and the records flattened out. In fact a Japan copy of U2's 'The Joshua Tree'(edge warp)was the exact same when I tried it in the past few weeks. It is now flat. The U2 was a lightweight LP as well and this makes flattening more difficult.
Good luck with your Sundazed LP! It is all trial and error really. I find 180 gram LPs easier to flatten than lighter weight LPs although some people appear to say the opposite?
Follow Ups:
How long was your average session?
In my case one session is 4 hours that is 2 hours heating and 2 hours cooling. You should do 'complete' sessions but I don't see any problem in varying the heating cycle although I would stay with the 2 hours cooling, just for safety sake.
Speaking of new records, I recently got two copies of Rhiannon Giddens 'Tomorrow Is My Turn' which were very seriously warped, for a new record??? This was pressed at Pallas in early 2015. It took 4 cycles for each record, that is to say 4 heating cycles and 4 cooling cycles giving a total of 32 hours. I was very surprised to see how very badly warped both records were, potato chip warps in each case. Defective pressings in both cases as well, unfortunately! The second copy was a replacement for the first defective copy, ironically! The records are now 'pond flat' though,as they say.
I am currently working on a 1973 U.S. Copy of John Prine 'Sweet Revenge' which I got from the U.S. just after Christmas. It is a used LP and it was badly dish warped on one side with an edge warp also. That is now almost fixed and I just reversed the record yesterday on the Disc Flattener (dished side up this time). I checked it a short while ago and the edge warp has now flattened out quite well. The dish warp is fixed. Again, this did not happen with 4/5 cycles. I would say it took 10 cycles with gaps in between. It will take 1 or 2 more cycles to get the edge warp to 99% perfect. I am not happy with say, an 80% fix when it comes to warped vinyl. With 'standard'/non audiophile U.S. vinyl, it is impossible to get a record 'pond flat'. But, and I readily admit this, I am fussier than most people. There is a bit of OCD involved, I think!
Thanks for the encouragement, I will proceed with this record!
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