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dgarretson

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  1. That was my post on Audiogon post regarding DIY thick .999 dead soft silver DC cables on SR7. Since then I have made some 10awg pure silver AC power cords as well, and am surprised how much better they sound on the SR7 than the several Synergistics and Furutech PCs I have on hand. I would have guessed that the superb Hynes SR7 would benefit little from a fancy PC, but this is not the case.
  2. I haven't personally worked with mu-metal, but my understanding is that it loses much of its permeability when bent and needs to be heat-annealed thereafter to restore permeability. From Wiki: ""Mu-metal objects require heat treatment after they are in final form—annealing in a magnetic field in hydrogen atmosphere, which increases the magnetic permeability about 40 times.[4] The annealing alters the material's crystal structure, aligning the grains and removing some impurities, especially carbon, which obstruct the free motion of the magnetic domain boundaries. Bending or mechanical shock after annealing may disrupt the material's grain alignment, leading to a drop in the permeability of the affected areas, which can be restored by repeating the hydrogen annealing step."
  3. One thing I like about the SRS rubidium master clock and the Antelope LiveClock distributor is their ability to accept external 12Vdc power. I've been using a Hynes SR7 for this. It does make an improvement relative to the stock SMPSs, and should be a consideration for comparisons at the high end.
  4. Cybershaft seems like a good choice. There is an Audiogon thread in which a few guys with high end DACs reported excellent performance and good customer service at Cybershaft. IIRC the Cybershaft seller packages a used Rubidium core with his own power supply and chassis. I'm not sure about the lifespan of a rubidium core, but they do need to be factory recalibrated once and awhile.
  5. That depends on whether your future 10mhz master clock has a 50 or 75 ohm output. 75 ohm is common in Pro studios, 50 ohm in lab equipment. I ordered 75 ohm SOtM units to match the SRS Perf-10 master clock that I was already using to time an Esoteric DAC and an Antelope LiveClock frequency divider into a Tascam DA-3000 DSD recorder. All have 75 ohm clock connections. Including the SOtM-modified D-Link switch, that's six devices synchronized to the same master clock. So when choosing the connector impedance, it's wise to think about where your system is headed.
  6. The comparison was made alternating between a Synergistics Master Coupler PC and a DIY PC of Furutech Alpha III bulk cable and high-end Furutech AC plugs into a Signal DU-5 balanced power transformer.
  7. I've had enough run-in now to compare powering the sMS-200Ultra and USBultra on the sMS-500 at 9V, to a double-regulated 7V rail on my Hynes SR7. The comparison is a bit unfair: the sMS-500 uses their standard copper Y-umbilical, as compared to a more heroic .999 solid silver umbilical with Oyaide connectors that I made for the SR7. Each conductor in the thick trunk portion is a twist of eight strands of 20awg(totaling around 11awg.) The trunk divides into two tributaries of four strands each(totaling around 14awg) into two Oyaide DC-2.1G plugs(2.1 x 5.5mm.) I particularly like the Oyaide DC connectors for their oversized solder points relative to standard Digikey items. In this configuration, the SR7 is an obvious step up from the sMS-500. More clarity, separation, depth, airiness, general refinement, on a dead- calm background. Of course there is a huge difference in price between these power supplies.
  8. Yes, but I won't have the full picture until I build a DC Y-cable for the SR7 to connect to the SMS200ultra and USBultra-- enabling comparison of SPS-500 to SR7. It still needs break-in, but it is clear that the master clock improves pretty much everything: more resolution, more natural pitch & timbre, better bass articulation, reduced digital smearing. The comparison is to a mR with hard adapter powered by two DC regulation stages in SR7 to mR via DIY silver umbilical. DAC is Esoteric K-01X, also synchronized to Perf 10. I made two silver USB cables: one 10" shorty between the SOtM units(which doesn't require a Vcc conductor), and a 30" cable from USBultra to K-01X DAC, which does require Vcc. Short Cable between SOtM Devices: Twisted data pair is made of 24awg 4-nines dead soft silver inside 2mm cotton tubes, both from VT4C Studio on-line. The pair is twisted around 1/2 turn per inch. Twisted bundle is wrapped in teflon plumber's tape. Bundle is wrapped in spiral (A) of 20awg 3-nines dead soft ground wire, 1/2 turns per inch, from Rio Grande on-line. Bundle is wrapped completely in spiral of 1" wide alum foil shield. Foil-encased bundle is wrapped by spiral (B) of 20awg 3-nines dead soft silver. Bundle is pulled through 7mm cotton or silk tube from VT4C. Spiral (A) is connected to ground pad of both USB connectors. Vcc pad is not used. Spiral (B) is soldered to drilled holes in both USB metal connector bodies. USB connectors Type A & B are high-quality gold-plated copper alloy from Norne Audio on-line. Long Cable with VCC between USBultra and DAC 24awg shielded twisted data pair and 20awg shielded twisted power pair are constructed as completely separate runs so that the two can be pulled apart for isolation. Each has a spiraled 20awg silver drain wire inside its respective alum shield, but without the above second silver drain wire on the outside of the alum shield. As above, the drain wire is soldered to a hole drilled in the metal connector body. You need a good magnifier lamp to solder at this level of detail. Tin the connector pads first with silver solder. Then just push the wires gently into place with the hot iron and use an Exacto knife to hold the wires down as the iron is withdrawn. All I've compared these wire to so far is a generic USB cable and the standard cable provided by SOtM. The improvement is huge. More fleshed out and detailed against blacker background. Photos below. I later added Ferrite clamps that are not shown. Also, I brought out the drain wire at the Type B end to support future addition of an external copper braid shield.
  9. I'm close to break-in of the combo SOtM SMS-200Ultra/ts-USBultra/SPS-500, together with the SOtM-sourced D-Link switch timed by the SMS-200Ultra via a 6" SMB cable from Digikey. All SOtM pieces are synchronized to a Stanford Research Systems Perf-10MHz rubidium clock via Canare 75ohm BNC cables, with the Perf-10 powered at 12 Vdc by a Hynes SR-7. This is definitely an improvement over mR powered by Hynes SR-7. The gestalt is enhanced with short DIY USB cables made of shielded 3 nines dead soft silver USB cables. Building a good silver USB cable is fairly simple. I wouldn't waste $$ in that area.
  10. This thread has been really helpful. So far I'm happy with mR in combination with upsampling by the Roon DSP engine on a QNAP TVS-882 i5 NAS. The mR is powered by a Hynes SR7 with two stages of down-regulation. A second rail of four on my SR-7 supplies a Stanford Research Perfection 10mHz rubidium clock that synchronizes an Esoteric K-01X and a Tascam DA-3000 recorder used for ripping vinyl to DSD128. I'm in progress with SOtM to place an order of (1) sMS-200Uttra, (2) tX-USBultra, (3) sPS-500, and (4) modified EN switch with clock link to (1). 1 & 2 will be fitted with 75ohm BNC master clock inputs to match the 75ohm outputs of the SRS master clock. I'll compare the sPS-500 to the SR7 in this application. Once you invest in toys like a master clock and an SR7, the applications keep expanding... Cheers, Dave
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