Warped record: acceptable?

Discussion in 'Audio Hardware' started by Johan Bos, Apr 28, 2019.

  1. Larry I

    Larry I Forum Resident

    Location:
    Washington, D.C.
    A "reflex clamp," like the one mentioned (has a washer around the spindle), will help with some warpage (but not so much an edge warp), provided that the platter itself is designed to work with such clamps. The clamp is really not there to cure warps--it is designed to tightly couple the record to the platter to damp vibrations in the record--but it does help with warps. I am less enamored with perimeter rings. They are hard to put on correctly and I am always afraid that careless use might cause an accidental bump of the delicate parts of the cartridge.
     
    Big Blue likes this.
  2. Josquin des Prez

    Josquin des Prez Forum Resident

    Location:
    Midwest USA
    Clearaudio did the outer ring right. It includes a POM locator ring specifically designed for my POM platter. It attaches to the platter and provides a lip to set the ring on, with impressive precision. The top surface of the ring is nearly flush with the top surface of the record (<= 1mm lip). As long as you cue the tonearm reasonably well there is low risk for an incident. I trust a $6K cartridge to it.

    [​IMG]
     
    Last edited: Apr 29, 2019
    Fishoutofwater likes this.
  3. jea48

    jea48 Forum Resident

    Location:
    Midwest, USA
    Maybe in Sweden they are.
     
  4. Big Blue

    Big Blue Forum Resident

    Location:
    Wisconsin
    True, the primary purpose is not to flatten warps, but in tightly coupling, it does fix some warps. I find with LPs that are just slightly dished (it’s not a miracle worker!), both sides benefit because of the “reflex” action of the clamping against the washer. I have examples on which the clamp actually seems to make it worse, too, though...
     
    patient_ot likes this.
  5. Classicrock

    Classicrock Forum Resident

    Location:
    South West, UK.
    Obviously limited to their own TTs but the Michell Orbe clamp deals with all but the worst dishes by using a raised centre ring over which a concave clamp forces the outer area of the LP down. Nearly all Lps are dished to some extent or another which is obvious when placed on the Michell platter but may not notice on many mats. Basically few Lps appear to be truly flat. Much more elegant than an outer ring which if you drop it will likely destroy your record and badly damage your deck. Far too inconvenient even for me.
     
  6. Josquin des Prez

    Josquin des Prez Forum Resident

    Location:
    Midwest USA
    I don't mind the inconvenience of the ring, and it just makes me more cautious with the whole setup, which is a good thing, IMO. I have not ever let the ring slip, but I have a specific routine to using it, and I consider it very low risk. You are correct that my ring is proprietary to the Clearaudio turntables (and only for Ovation and Innovation models at that).

    My TT doesn't have a mat either and I see that many/most records have a bit of air underneath when sitting concave side up.
     
  7. Larry I

    Larry I Forum Resident

    Location:
    Washington, D.C.
    I think it was a Clearaudio representative that I spoke to about using a ring on my Basis Debut turntable. He said that he has used their ring on Basis tables and found that they offer an improvement in sound even when used with a table that has a vacuum clamp like my table. He said the improvement was smaller than is the case with tables that don't already employ such a comprehensive clamping scheme, but, there is an improvement. I might try the ring some day. It would certainly help with those records that have a slight edge warp that prove to be hard to get the vacuum clamp to seal properly at the edge.
     
    Josquin des Prez likes this.
  8. Josquin des Prez

    Josquin des Prez Forum Resident

    Location:
    Midwest USA
    That's the other thing for me. Once I went to a heavier clamp (850 gr) and the outer ring (at 1500 gr) it improved the sound. That was the main for it. Flattening dish warps is an added benefit.
     
  9. Johan Bos

    Johan Bos Active Member Thread Starter

    Location:
    Netherlands
    Hi, thank for all your replies! I finally decided to return the record. I got a new one, at first sight it looked perfect. It is much flatter and looks clean. I turned on my turntable and during the first seconds I heard a loud "plop" sound, three times in total, every about one second. After that the first track starts. The rest of the records sounds good, no further plop sounds. I inspected the first grooves and after some searching I managed to spot one small white dot. I have records that have similar spots, but they don't produce a loud plop sound like this one. I don't know what to do: just accept it, or return it again... I made movie with sound of the plops:



    (you hear some background noise of my camera)

    What do you think: is it acceptable for a new record? It seems to be difficult to just get good records it seems...
     
  10. Classicrock

    Classicrock Forum Resident

    Location:
    South West, UK.
    Not great but you can avoid it by cuing close to the start of the music (presuming this is on the run in). If the white dot is a piece of embedded paper a wet clean might remove it partially and reduce the plop.
     
  11. Aftermath

    Aftermath Senior Member

    Buying vinyl is a toss of the dice nowadays, so I'd probably keep that copy.
     
  12. Big Blue

    Big Blue Forum Resident

    Location:
    Wisconsin
    So the problem is all before the music starts, just on the lead-in? If so, I would probably roll with this copy. As suggested, I would try to remove the spot with cleaning, and/or try to remember that one needs to be cued further in to try avoiding the spot with the stylus.
     
    patient_ot likes this.

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