Recent content by Stacore

  1. Stacore

    London Decca Jubilee revisited - combination with SME 3012R ?

    Azimuth - crosstalk measurements or as some claim better yet HF sweep with a test record and equalizing HF perfromance VTA/SRA - cartridge top parallel to LP (on London Reference at least) then by ear. Cheers,
  2. Stacore

    London Decca Jubilee revisited - combination with SME 3012R ?

    I second Bill. Before getting Jubilee on trial, I've loaded my head with all kinds of fears of "dreadfull Decca", loose bearings of 3012R and other bs. None of that has happened in my case. The combo started singing from the very first touch.
  3. Stacore

    London Decca Jubilee revisited - combination with SME 3012R ?

    Had the same question some years ago. Got a Jubilee on tests, installed in heavy Orsonic AV101 headshel. Had also FR200 damper, anticipating problems but don't remember if I finally used it al all. If so, with the smallest paddle. The combo performed beautifully, no tracking issues, resonances...
  4. Stacore

    Is this voodoo or science?

    This is indeed a v good question - how to re-introduce solid knowledge into High End in place of marketing and bling-bling. Using this example, I'm sure the noise components in the TT bearings have been once thoroughly studied and identified but then it all got lost and now individual people...
  5. Stacore

    Inexpensive but powerful upgrade from The Lotus Group

    Joe, you reminded me of the same thing I did years ago when constructing own phono stage :) Sorbothane pads on every el cap. I must admit I've never bothered to do a test before and after. Caps are vibration sensitive. Period. There was once even a guy who opened electrolytics and repacked them...
  6. Stacore

    Is this voodoo or science?

    Hi RJ, Very interesting question. Let me quote original findings of a fellow engineer Korf Audio: http://korfaudio.com/blog44 He measured bearing noise in a simple TT and found in his setup that a vast majority of it comes from...the LP playback! Even with a simple and unpretentious bearing...
  7. Stacore

    Weights of Common Metals

    I like very much the idea of the member Stehno - a clamping mechanism that would clamp the equipment to the rack/platform/shelf. Combined with a properly designed shelf/platform, I can imagine this providing a working solution for internally generated/captured vibrations. We did this...
  8. Stacore

    Weights of Common Metals

    Forgot to add that slate itself provides some form of CLD damping due to its layered structure. A well known and explored in audio fact. However, it is not a wonder material by its own and comes with its own set of problems if used just like it is. Mainly adds colorations on lower MF. Hence some...
  9. Stacore

    Weights of Common Metals

    Hi Tima, My pleasure :) Re 1. First and foremost It wants to prevent external vibrations from reaching TT. How it does it - isolates, damps, both, in what proportions, by which mechanism it's in a sense secondary. Re 2. I have no idea where all this obsession with damping internally generated...
  10. Stacore

    Weights of Common Metals

    Yes, the goal is then to isolate. Or more precisely to damp (in theory, to isolate - to turn the virbrations back, to damp - to burn them; but real life solutions are usually a mix of the two). In CLD approach, you want to divert as much of the vibrational energy to lossy medium as you can. If...
  11. Stacore

    Weights of Common Metals

    Indeed, sound velocity is one of the basic parameters of a given material. It depends on the wave type, the basic for a longitudinal wave is: c=sqrt(Young modulus/density) In more, detail the speed of sound is governed by the dispersion relation. In the simplest scenario, some of the wave...
  12. Stacore

    Weights of Common Metals

    Yes, although the elementary principle of elastic deformations of solids is very simple - masses on springs, it then grows to some baroque variety of waves, modes etc. The main message was that density alone does not determine the behavior. Must be considered with some measure of elasticity...
  13. Stacore

    Weights of Common Metals

    Apart from density, the second important parameter is the Young (or elasticity) modulus, describing the elasticity of the material. Both these parameters determine the sound velocity in a given material. For example for longitudinal waves the velocity = Square root (elasticity / density). But...
  14. Stacore

    Sublime Sound

    Damping is another factor apart from the low resonance. In a dedicated isolation platform there is more room to design and implement various damping mechanisms. Cheers,

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