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Warren Jones

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About Warren Jones

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    Terang
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    Australia
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    Warren

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  1. I know how to measure runout it was spinning the platter on the motor that sent me measuring to determine what caused the vertical runout. I also measured TIR of the motor and spindle in the lathe. I posted because I thought people might be interested. That is an AA grade granite surface plate with the motor sitting on precision blocks accurate to 0.005mm. Look at the measurement of the motor mounting flange compared to the platter mounting face. Platter is not mine it's made for someone else which is why I needed to determine the cause, as when I indicated the platter
  2. Platter finished Vertical runout was awful so I commenced measuring. All the runout was in the motor.. Next project is to modify the motor with a larger bearing and investigate if I can fit an inverted bearing into the SP10 motor.
  3. I'm in the process of machining a stainless steel platter for an SP10 so we'll see if that improves things. 2 x 304 SS blanks and an almost finished platter bottom. This platter will have 16mm Delrin top and is for a chassis less install. I have a few upgrades on the boil. A chassis less plinth where the motor will be mounted directly to the plinth and electronics separate. I am also well down the track in designing and manufacturing a stepper motor driven linear tracking arm driven by an Arduino. The Arduino code is written and operational, just finalizing
  4. The resin plinth is about as good as it gets for the SP10. I get my fiberglass supplies from Trojan in Newcastle NSW even with shipping they are cheaper than Bunnnings with my wife's staff discount. I like the timber surround looks like Tassie Oak. All my DIT gear has Tassie Oak front panels finished with Scandinavian oil, I like the look.
  5. Mine plays through a Pass Labs Xono and I would never go back to an MC after listening to this cart. The SAS/R are made to order so it takes a little more time, mine took about 6 weeks to arrive. I think you will be very pleased.
  6. Correct its a squarewave and the rise and fall times were symmetric. I was wondering who would pick that up. I used the trailing edge as the noise was lower.
  7. I also have 1st UK pressing and it sounds brilliant. Only problem is now UK pressings are expensive and who knows what you will get. IME ALL original pressings I have are far superior to the later new pressings. I stopped buying new LP's for this reason. ALL apart from some eyewateringly expensive LP's are digitally mastered and in my system I can hear the difference. That does not mean they are not good just that I prefer the old analog masters.
  8. Hum can be difficult to isolate the source. Before trying anything. Does the SL10, PL15 and phono pre have 2 or 3 pin plugs?
  9. I know we are way off topic but I thought I would do the measurements so anyone looking to purchase a SAS/R can see clearly they are superior to the SAS/B. As the diamond and suspension are identical the only difference is the Ruby CL and no glue (visible @ 100 x magnification) on the diamond. Here are the measurements from an EPC205 with both a Jico SAS B and R. Measurement were done with CBS STR112 test LP, 1kHz squarewave. Output is taken directly from the cartridge on the input of the phono preamp The measurement confirm there is no perception bias and clearly show
  10. Moving mass or Movement Of Inertia is I=mr^2 where I = MOI, m=mass and r^2 is the mass distance from the pivot squared. So the cantilever mass will have minimal effect on MOI. The greatest influence is the mass on the end of the CL and how far it is from the pivot. So stick a great blob of glue on the diamond and this will significantly increase MOI.
  11. So why is there glue on the end of the boron CL when the diamond is nude? My EPC205 boron and ruby CL are the same length give or take, I know this from setting them up on the linear arm with a borescope. The OEM Technics Mk3 has a shorter CL.
  12. These are my EPC205 stylus. The SAS/R has far greater detail than the SAS/B SAS/B SAS/R
  13. The MAJOR influencing factor for bass response is the room, you can do lots of DPS tweaking but this will do nothing to tame room modes. Play a 100Hz tone and walk around the room you will hear it get louder and softer depending where you are in the room. The worst place is in the corners of the room there the tone will be loudest.
  14. Looking at the difference between the SAS/B and SAS/R. The SAS/B has a bonded diamond whereas the SAS/R is a nude diamond, this is most likely the reason the SAS/R has lower moving mass. I can say the SAS/R on an EPC205 is wonderful and detail is wow. Fleetwood Mac's "The Chain" I can hear someone pick up guitar from a stand at the very beginning of the track.
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