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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
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?
twl
3,251 posts
 
It should go in the phono stage, and many phono stages have them built in. However as any filter network, it has a "knee" with corresponding rolloffs. If the filter knee is set high enough to cover everything below 20Hz, it will have an effect up into the areas above 40Hz. This can compromise bass performance, since it is being partially filtered out. If the knee is set down below 10Hz, it may not be fully effective at some of the frequencies you want it to filter. It requires an educated design, based upon experience. There are compromises in everything.
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