Emilg

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About Emilg

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    Senior Member

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  • Gender
    Male
  • Location
    Enschede, Holland
  • Interests
    Computers, music, classical guitars, my old Saab and violins

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  1. Emilg

    Thin top /high density?

    Aha!
  2. Emilg

    Thin top /high density?

    Figure 1 just shows what the sizes A1, A2, B1, etc. stand for (the sides of the wedges), so it applies to both wedge 1 and 2.
  3. Emilg

    Thin top /high density?

    C is the speed of sound of the spruce, measured by Don Noon's (ridiculous easy ) way by tapping one end of the wedge, looking for a sensible frequency peak = F, multiplying by 2x the length L. C is in m/s. I understand C for spruce is usually between 5000 and 6000 m/s, so 7000 m/s is pretty high. The radiation ratio for wedge 1 would be 7062 / 450 = 15.7 which is high too. (so good according to some) Wedge 2 has a RR of 5508 / 460 = 12, which in turn is quite low. edit: that is when those C's do belong to wedge 1 and 2 in the right column.
  4. Emilg

    Thin top /high density?

    Both wedges are on the heavy side, but not nearly as heavy as Henry's 0.52. But i believe even some Strads had 0.46 tops. C for wedge 1 seems pretty high, for wedge 2 normal/lowish? What is meant by ring M and Hz/cm3?
  5. Emilg

    Thin top /high density?

    that's it! it was quite dense wine as i remember, but fully seasoned
  6. Emilg

    Thin top /high density?

    Last time i asked for the spruce density from a supplier, he replied: 10-12%
  7. Emilg

    Fake maker - can anyone identify please

    i think you're right i should have looked further
  8. Emilg

    Fake maker - can anyone identify please

    you can get them much cheaper! https://www.latestcore.top/fine-old-czech-violin-by-frantisek-bocek-p-9734.html
  9. Emilg

    Thin top /high density?

    Great, let us know how it turns out! I wonder where the B1's end up...
  10. Emilg

    Thin top /high density?

    Hi Henry, M5 is actually pretty easy to see in the spectrum as a big peak, as long as you hold the plate between thumb and finger in the right spot (node) and knock at the right place (anti-node). You can hear a clear full ringing of the plate. (but that's not why it's called the ring mode ) my guess is that the M5 is somewhere in the low 300s
  11. Emilg

    Thin top /high density?

    that is some incredibly stiff wood then! i'll leave it up to the experts like Don and Peter how to proceed with that
  12. Emilg

    Thin top /high density?

    thta's pretty heavy wood, so maybe the SP area can be thinned some more to around 2.5mm
  13. Emilg

    Thin top /high density?

    you probably mean 330 Hz, with BB it will be around 370 Hz at 76 g .. so there's a bit of room left what was the density?
  14. Emilg

    A few old violins compared

    yes i've seen it a couple of times, nice demo's how do you measure the B's, or do you hear them?
  15. Emilg

    Cork Burnish?

    Hi Doug, i had used cork for string cleaning a couple of times, but then i read this: http://www.warchal.com/faq/cleaning_using_cork.html