sdlevene
Responses from sdlevene
| Turntable platforms Halcyonics/MinusK/vibraplane Hatari,You probably do not want to mount the motor on a separate platform because cogging of the motor will excite resonances of the damped suspension system. This will occur even with a Halcyonics or Minus-k platform. I have a a VPI TNT turntable... | |
| record cleaning findings/puzzle It is quite common for solvents sold as spectroscopic-, HPLC-grade, or even higher purity to contain significant levels of contaminants that remain behind after evaporation. These contaminants are detectable in electron or scanning-probe microscop... | |
| Medical Isolation Platforms Ducatirider,The isolator's resonant frequency is a good figure of merit for this type of analysis. All objects have a natural set of resonant frequencies; this mode structure is typically modeled in terms of mass/spring systems. The response of th... | |
| Medical Isolation Platforms Jtimothya,The BM-8 is their highest-performance isolator for loads in the 100-lb range and has the additional advantage of a low profile (about 4 in. high). I replaced the standard top plate with a 28x20x0.75-in slab of polished granite to support... | |
| Medical Isolation Platforms Minus-k and Halcyonics are comparable in vertical-isolation performance and both are superior to the Vibraplane. The Minus-k systems are passive and have resonant frequencies (0.5 Hz) that are an order of magnitude lower than pneumatic isolators. ... | |
| Do enzymes only live for 8 hours As a professor of molecular biology and physics, I'm happy to weigh in on this subject. DNA enzymology is a major focus of research in my lab; we study enzymes that recombine (i.e., cut, rearrange, and rejoin) DNA in E. coli and yeast.i.) Most enz... | |
| Best rack for non-suspension turntable? Every material has a set of resonant frequencies (mode spectrum). I believe you may be referring to the boundary conditions that apply to the problem and this is why I qualified my comment with the phrase "All other things being equal, . . . ." Th... | |
| Best rack for non-suspension turntable? Be aware that using multiple layers of isolation materials can have a negative effect on vibration isolation. For example, if you have two platforms and two layers of isolation material, this is equivalent to a two-mass/two-spring system of couple... | |
| Vibraplane vs. Minus k for Turntables The BM-8 gives vertical transmissibility values that are comparable to Halcyonics' benchtop product (the Micro) in the range >=5 Hz. However, the BM-8's horizontal isolation is significantly less effective than the Halcyonics product. As Tbg po... | |
| Vibraplane vs. Minus k for Turntables I'm not sure what's meant by "100% effective." Whether f0 = 2 Hz is enough depends on specifics. In my case, I live in an 80-year-old house with suspended wood floors and there are plenty of ambient noise sources near 5 Hz, e.g., washing machine, ... | |
| Vibraplane vs. Minus k for Turntables Hi Larry,I have a Minus-k BM-8 system that supports my TNT Mk.? (upgrades of various vintages). Performance is extremely impressive and I especially like the maintenance-free aspect of the isolator. Although I have no experience with the Vibraplan... | |
| Audiophile grade analog to digital converter I've been researching similar systems for vinyl archiving and transfer. Two hard-disk recorder products come to mind: the Tascam DV-RA1000HD and the Alesis Masterlink ML-9600. The Tascam recorder will support up to 24-bit resolution at sampling r... | |
| Best rack for non-suspension turntable? A more cost-effective solution than the Halcyonics, with comparable performance, is a Minus-k BM-8 isolation system ($2500). My recollection is that the WTC is not a high-mass design (< 100 lbs) and therefore well within the payload range of t... |