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How warped can you get?

Ok, I should have looked closer at the LP before buying it. I was lifting a newly purchased copy of Renassiance Novella off of my cleaner and I noticed that the middle lifted quite a bit while the edge was still down. The surface looked really clean with no noticeable scratches so I decided to give it a test spin. I swear the cartridge is oscillating 1/4" in the verticle, but the playback is really good. I mean, it would be pretty hard to not to notice if Annie Haslam's voice was being distorted. I don't dare take the covers off of the woofers and have a peek.

So, I have to ask what is the most warped record you play successfully on your TT?
dan_ed

Showing 3 responses by dougdeacon

dougdeacon
3,338 posts
 
Anybody ever successfully flattened a warp? I've read posts about putting a disc between two pieces of glass in a 130F oven for ten minutes or so. What do you think?
dougdeacon
3,338 posts
 
Tom, Thanks for the cautionary tale. I trust you were able to find another copy. A first pressing though... ouch!

I remember warnings to put the record in a cold oven and not to exceed 10 minutes @ 130F. Still, I wouldn't experiment on anything that isn't already scratched up.

I'm trying to remember what Frisbees cost in 1968. $2.99 seems a little high.
dougdeacon
3,338 posts
 
The only obvious trouble I have with warps is cueing. Once the stylus is safely in the groove I hear no warp-related problems.

Still, I don't like to see my woofers moving, and think of all the LF energy the electronics have to deal with! What does anyone think about a a low-pass filter? If it's a good idea, how early in the signal path should it go?
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