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Thread: Recommend me a preamp please?

  1. #61
    Join Date: May 2008

    Location: Venice, Italy

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    I'm Neil.

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    Quote Originally Posted by Edwardlon View Post
    Thanks Neil. Very interesting. Just had a quick look at see the maker (Richard Bews) seems highly regarded. His LS3 and anniversary pres are - um - expensive.

    Bit nervous buying from Poland though.

    Anyway, let me look further.
    Happy to help. In my direct personal experience with ebay in the event of a problem (providing you only use Paypal) in a dispute they ALWAYS take the side of the buyer. Until proven otherwise, the seller is always the default problem. A minimal risk as best i can judge. Bit different if the seller was in North Korea, but you never can tell. Neil

  2. #62
    Join Date: Feb 2008

    Location: South Wales

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    I'm NotTakingLifeTooSeriouslyTheseDays.

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    A pasive working in a real world situation will only be as good as the matching of the impedances of both the source and power amp!
    Also cable capacitance, type of cables, and the length of said cables will all have a marked affect on conventional passive attenuators.
    So, taking these variables into account, IMHO, and from experience, the majority of folk who try a passive [conventional potentiometer, or switched attenuator] will not experience fully' the seemingly attractive merits of such simple attenuation...
    Quote Originally Posted by Arkless Electronics View Post
    As I said earlier it is not possible for an amplifier to change dynamics unless it is distorting. A passive can not change them at all as it never distorts. Only compression can occur and the this would have very obvious distortion with it. An amp running out of power and clipping is the most obvious example. If a 10W amp needs to produce 15W to reproduce the peaks well it can't do it so anything beyond 10W will be huge amounts of really nasty distortion rather than increased volume.
    "Today scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality"
    Nikola Tesla



    We Send our kids to school to be Educated, not Medicated!

  3. #63
    Join Date: Mar 2017

    Location: Seaford UK

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    I'm Dennis.

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    Roth and Ark, I thought we were discussing Ark's assertion that distortion can appear to give greater dynamics.

    I cannot see that clipping can do that, and indeed on another forum it was after a lengthy discussion with which I agree, far from increasing dynamics, that it does the reverse, it compresses.

  4. #64
    Join Date: Mar 2016

    Location: Barnet, london UK

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    I'm Adam.

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    I thought we were responding to the OP request for a pre heads up...
    "lack of passion is fatal"
    LP12, Kore, Lingo2, Aro, SKale / DV XX2Mk2 / WAD 300b Power Modded, Mesh Plate Valves / David Coe AD Audio 'Satchmo' Pre & Phono / Hashimoto HM-7 SUT / AD Audio 'Little Gate' Jfet MC Cartridge Amp / Tannoy 12" MGs in Chatsworth size cabs / Speaker Cables: Duelund DCA16GA / Rpi3 & Digi + pro / SW1X Audio Design USB-SPdif / SW1X Audio Design DAC 1 Signature / Interconnects: Duelund DCA20GA home brew / SW1X Audio Phono SPDIF AERO 6 / David Coe AD Audio Silver USB / Synology NAS Drive / Tidal HiFi

  5. #65
    Join Date: Oct 2012

    Location: NE England

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    I'm Jez.

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    Quote Originally Posted by Pharos View Post
    Roth and Ark, I thought we were discussing Ark's assertion that distortion can appear to give greater dynamics.

    I cannot see that clipping can do that, and indeed on another forum it was after a lengthy discussion with which I agree, far from increasing dynamics, that it does the reverse, it compresses.
    OMG! I've been arguing the exact opposite from the beginning! And from a purely technical not subjective standpoint. And it's Mr Arkless to you Den!

  6. #66
    Join Date: Oct 2012

    Location: NE England

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    I'm Jez.

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    Quote Originally Posted by anthonyTD View Post
    A pasive working in a real world situation will only be as good as the matching of the impedances of both the source and power amp!
    Also cable capacitance, type of cables, and the length of said cables will all have a marked affect on conventional passive attenuators.
    So, taking these variables into account, IMHO, and from experience, the majority of folk who try a passive [conventional potentiometer, or switched attenuator] will not experience fully' the seemingly attractive merits of such simple attenuation...
    Whilst I disagree with everything you say the bit in bold I couldn't disagree more strongly with! THERE IS NO IMPEDANCE MATCHING OF ANY KIND! Impedance matching as such matters at RF where transmission lines of a certain characteristic impedance are matched to (usually) 50Ohms to give the best VSWR and to properly terminate filters etc. All that matters is that the source impedance is far lower than the load impedance. There is no magical figure where anything is in any way "matched".

  7. #67
    Join Date: Oct 2016

    Location: Bolton, England

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    I'm Andrew.

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    Quote Originally Posted by Pharos View Post
    Roth and Ark, I thought we were discussing Ark's assertion that distortion can appear to give greater dynamics.

    I cannot see that clipping can do that, and indeed on another forum it was after a lengthy discussion with which I agree, far from increasing dynamics, that it does the reverse, it compresses.
    This is speculation and guesswork but it may be possible that the brief clipping of transients can create the impression of enhanced dynamics by generating HF harmonics which give a sense of "bite" and more attack.
    Yes, certainly gross and sustained clipping crushes dynamics but you have to have guitar fuzz box levels of distortion for that.

  8. #68
    Join Date: Feb 2008

    Location: South Wales

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    I'm NotTakingLifeTooSeriouslyTheseDays.

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    Well,
    Your perfectly entitled to your opinion, the same as I am, but as on many occasions, your black and white attitude wont discourage me, and I will continue to put my point across, whether you agree with it or not.
    Quote Originally Posted by Arkless Electronics View Post
    Whilst I disagree with everything you say the bit in bold I couldn't disagree more strongly with! THERE IS NO IMPEDANCE MATCHING OF ANY KIND! Impedance matching as such matters at RF where transmission lines of a certain characteristic impedance are matched to (usually) 50Ohms to give the best VSWR and to properly terminate filters etc. All that matters is that the source impedance is far lower than the load impedance. There is no magical figure where anything is in any way "matched".
    "Today scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality"
    Nikola Tesla



    We Send our kids to school to be Educated, not Medicated!

  9. #69
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 399
    I'm Dennis.

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    First of all I apologise Arkless Electronics and Rothwell Audio if my abbreviations have caused offence; that was not intended,and perhaps a bit lazy of me.

    In post 45 there seems on reflection to have been a divergence on the point being discussed.

    You went on to talk about clipping, a subject I was not considering. I was thinking about distortion originating within an amplifier quite other than clipping, perhaps giving the impression of greater dynamics.

    What I had in mind was the peculiar results I had with my old Nelson-Jones 10+10 on one particular track by Michael Hedges. Its effect was to somehow hype and increase the sense of attack of his guitar, and in a way I have never again heard on any other system. That may have been interpreted as sounding more dynamic.

    Regarding impedance match, the standard used in telecoms and in broadcasting was 600 ohms, this from transmission line theory, but it may have changed. It was based on maximum power transfer theory and avoidance of standing waves and reflections. I remember drawing the Gaussian graph of power transfer at college.
    We have 75 ohms for FM aerials.

    I remember at that time, about '75, arguing with my telecoms lecturer when we introduced audio amplifiers into the source/load matching discussion, saying that with audio amplifiers we are not interested in power transfer from source to load, but that we are interested in voltage transfer to load, which we want to maximise.

    I think your post 67 Rothwell Audio gives a very reasonable postulation, and it probably agrees with my 'Hedges experience'.

    Punctuation can improve communication and reduce ambiguity.

  10. #70
    Join Date: Aug 2009

    Location: Staffordshire, England

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    I'm Martin.

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    Quote Originally Posted by Pharos View Post
    Punctuation can improve communication and reduce ambiguity.
    Indeed it can; in fact it is the sole reason it exists.

    As I pointed out earlier when people use the word 'dynamics' they do not use it to mean 'dynamics' as in the text-book explanation, it is often used to have other meanings and is then as 'subjective' an expression as 'musicality'. So the fact that some people say that passives 'lack dynamics' does not mean they heard a lack of dynamics, but what they personally call dynamics, which could actually be anything.

    If we don't mean the same thing with the same word then communication starts to become difficult. When technical terms are co-opted as general subjective descriptions the problem escalates. This is the source of many on line argument between two or more people who actually agree, they just don't realise they do.
    Martin



    Current Lash Up:

    Sony X505ES CD Player * NVA P90SA passive pre / NVA A30 Power amp * JM Lab Electra 926 loudspeakers *



    "I hate to advocate drugs, alcohol, violence, or insanity to anyone, but they've always worked for me." - Hunter S Thompson

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