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Thread: Anyone have a Valab LCR Phono Stage ?

  1. #51
    Join Date: Nov 2015

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    Quote Originally Posted by pure sound View Post
    If you put a square wave through an RIAA network surely that is what you'd expect?

    Otherwise, what exactly do you think it should be doing with the high frequency component of the waveform? If it let it through unaltered it wouldn't be much use in eq'ing the output from a cartridge playing a record.

    Here's an Aurorasound Vida reproducing a 1 KHz sine wave.



    and here is the same phono stage applying RIAA correction to a 1 KHz square wave



    That's what it's supposed to look like. You need to remember what a square wave actually is.
    Square?

    Look, my understanding of these things may be rudimentary in comparison to guys like yourself but the fact it can't produce a square wave cannot be misinterpreted, surely.

    My understanding is that the squarer the wave, the better the response. Is that not correct?
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  2. #52
    Join Date: Jan 2016

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    Quote Originally Posted by pure sound View Post
    If you put a square wave through an RIAA network surely that is what you'd expect?

    Otherwise, what exactly do you think it should be doing with the high frequency component of the waveform? If it let it through unaltered it wouldn't be much use in eq'ing the output from a cartridge playing a record.

    Here's an Aurorasound Vida reproducing a 1 KHz sine wave.



    and here is the same phono stage applying RIAA correction to a 1 KHz square wave



    That's what it's supposed to look like. You need to remember what a square wave actually is.
    I take you haven't applied inverse RIAA to the signal , square is a good indication but frequency sweep or white noise response tells bit more

  3. #53
    Join Date: Oct 2012

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    Guy, the supposed square wave is 1KHz through a reverse RIAA network then through the phono stage. Hence the derision.

  4. #54
    Join Date: Jan 2008

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    That would explain it if so. Out of interest, how accurate is your reverse RIAA?
    Last edited by pure sound; 26-06-2019 at 07:43.

  5. #55
    Join Date: Oct 2012

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    Probably 0.5 dB, constructed with accurate parts.

  6. #56
    Join Date: Feb 2010

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    Quote Originally Posted by Firebottle View Post
    Probably 0.5 dB, constructed with accurate parts.
    It's a bit unfortunate the way this thread has panned out, a casual reader or someone jumping in might assume these dodgy traces are from the Valab, which they aren't .. they are from the Lounge Audio. I was confused myself when I came back into this thread.

    Or maybe I'm just a bit slow.
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  7. #57
    Join Date: Mar 2016

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    Quote Originally Posted by montesquieu View Post
    It's a bit unfortunate the way this thread has panned out, a casual reader or someone jumping in might assume these dodgy traces are from the Valab, which they aren't .. they are from the Lounge Audio. I was confused myself when I came back into this thread.

    Or maybe I'm just a bit slow.
    +1
    No you are not a bit slow.
    The Thread was for the VALAB LCR

    All this has nowt to do with the Valab Phonostage...
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