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Owen Y

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Owen Y last won the day on July 1 2012

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About Owen Y

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    Auckland
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    New Zealand

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  1. Pros & cons IME. ITs have limitations & need to be v well designed & implemented in order to minimise these drawbacks. OTOH passive components, like caps impart audible 'flavours' too - at least at 'hi-fi' levels of 'discernment. Don't you think? There's always trade-offs it seems in this game Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  2. @Fro's Pushkar pic reminded me.... This is from the 2014 Pushkar Mela (Camel Fair). Not much work for camel breeders these days, sadly. This lady's name is Sindhuri, I believe she's Kalbeliya (tribe) - some call them 'gypsies'. Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  3. Hi Grant - I agree (& also with @Chill3) that the effect is small - but in high-end audio, we usually contend with this level of factors & we are talking about the near-static situation, when it comes to VTF. However, when it comes to 'inertial' mass (Rotational Inertia ), as said, at the stylus tracing frequencies that are of interest to us (> than say 12Hz), the stylus 'sees' the tonearm as being essentially 'rigid' - as in an optimally-matched cartridge compliance - tonearm Effective Mass combo. (Sorry, was not my intention to digress this nice TT page & will refrain from adding further comment about this... as they say - YMMV ) Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  4. Hi Grant - as VTF & c'wt balance result from vertical gravity force, the moment lever length is always the horiz. distance from the arm pivot (not the radial lever length). Sorry if my terminology is a bit rusty, it's been a while since I attended physics classes Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  5. Sorry @andyr - I neglected to elaborate.. The c'wt's horiz distance from pivot, varies more significantly with tonearm up-down movement, when it's underslung - compared with an arm-axis mounted c'wt - relative to the stylus up-down movement. This is all only an occasional problem. But of course, all your records will be flat Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  6. Unless the c'wt is 'hanging' - like the early Roksans.... Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  7. Hi @andyr Rotational Inertia - yes, it is proportional to mass x distance from rotational centre, squared,. However, at the stylus tracing audio frequencies that are of interest to us (> than say 12Hz), the stylus 'sees' the tonearm as being essentially 'rigid' - in an optimally-matched cartridge compliance - tonearm Effective Mass combo.. Underslung c'weights - it's geometry, perhaps a pic will illustrate this best. (However, there may be other factors at play, c'wt fixing, decoupling, etc & it will sound different or even better, as @mloutfie found. eg. the Effective Mass of a tonearm is changed when the c'wt is moved or changed in mass, by any significant amount. ) Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  8. That's nice, early Golmund. IIRC Goldmund had their own (motor driven?) linear tracking tonearm. Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  9. I have to say personally that I'm never a fan of underslung c'wts , esp. positioned close to the pivot... Tracking force can vary much more with vertical movement, eg. record warps. @mloutfie - did you try with just 1 hanging thread? eg. like Frank Schroeder does - those Neodym magnets are quite strong. Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  10. Yes, most audio 'hum' problems arise from AC lines which radiate EMF, not DC flux fields like magnets. Or from poor Grounding. The main concern would be keeping such magnetic influences away from the cartridge magnet generator - which this is. (PS. I have found that some MM cartridges will be affected by the SP-10's DD motor - but only outside the perimeter of the platter-chassis metalwork (ie. when the tonearm swings or slides out to its rest.) Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  11. Well I guess that with @mloutfie's design here, the 4 hanging wires connect to the central 'boss' all in a line, that is more or less the axis of vertical rotation of the arm...? Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  12. Toroidal PTXs: Dudes, - recently we got one from TorTech Pty in W Sydney, they were helpful, & just happened to have just what we needed on the shelf.... Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  13. Hi @aussievintage - all I can say is... - surprised me too, much more dynamic, alive - well documented by other DHT amp builders - try it yourself Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  14. Hi @georgesgiralt - I wonder if the 35 degC fluid temperature (which will further rise with ultrasonic action), softened the vinyl & subsequent brush vac drying caused some debris to embed into the vinyl grooves? As said, i do not find it necessary to apply heat to the ultrasonic-detergent process. Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
  15. Good thoughts guys. @georgesgiralt - I have not tried Polysorbate yet, but I would try increasing concentration from 1:1000 to 1:500 (or more, it is inexpensive). I don't feel any need for heating myself. Some 'dirt' may need a solvent to solubilise (eg. iso alcohol pre-clean) or an enzymatic pre-clean for food protein or such. Cheers, Owen Dark Lantern blog - http://darklanternforowen.wordpress.com/
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