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  1. dave slagle

    Miyajima Labs 1.0 mil Infinity Mono

    I would never play a mono record with a cartridge with low or no vertical compliance. At high frequencies where the velocities are the highest due to the riaa curve the pinch effect causes a conical profile to have movement in the vertical plane and if there is no compliance to absorb this...
  2. dave slagle

    Zero Distortion: Stacked Quad 57s

    for example????
  3. dave slagle

    Zero Distortion: Stacked Quad 57s

    I'm with you on the broad strokes but in order to get surgical precision you either need to go digital or use steep slope filters, both of which are sonic deal breakers for me. dave
  4. dave slagle

    Zero Distortion: Stacked Quad 57s

    I think this is key. I would bet the bulk of the bad experiences with EQ's are with the 10 band units we all had in the past. In those, each band was an octave. In order to make this work steep high Q filters are needed and that is exactly the type of filter that has the 'all the king's...
  5. dave slagle

    Zero Distortion: Stacked Quad 57s

    agreed 100%... It can even be argued that having multiple tonearm cartridge combos for different flavors is simply a means of adjusting EQ. I suspect the bulk of the bad name given to equalizers (and tone controls for that matter) is due to their implementation and not the underlying concept...
  6. dave slagle

    Zero Distortion: Stacked Quad 57s

    the line level signal that drives the quad amps also drives a permalloy 50 amp that drives the speaker level inputs of the plasma.
  7. dave slagle

    Zero Distortion: Stacked Quad 57s

    This becomes a very slippery slope and ultimately comes down to what you are trying to achieve. If the goal is replication of some mythical straight wire with gain then I agree with your premise. However; if the goal is creating the most enjoyable individual listening experience then it can be...
  8. dave slagle

    Zero Distortion: Stacked Quad 57s

    The plasma tweeter adds a significant amount of air and ambiance to the overall setup. dave
  9. dave slagle

    Zero Distortion: Stacked Quad 57s

    Hey, JP is fighting the registration spam-bots so until he can respond and I will handle many of the technical questions in the meantime. The speaker cabinets are made by a craftsman in Maryland to this specific project. In the original '57 design a single amplifier drives an input...
  10. dave slagle

    Thick Vinyl Records

    it was proposed to me last year during the lecture at the ETF that thinner 120-140g records are better since the material flows better, keeps a more even temperature while pressing and cools quicker and more uniformly leading to more consistent results. The swiss copywriter that proposed this...
  11. dave slagle

    HumminGuru - an inexpensive desktop RCM

    hey Neil, great work!.... any opinions of following your procedure above with the 25% premix in the nalgene bottle and then mixing several 1 gallon jugs of distilled water at once by putting 22-33 drops in each? This would provide several gallons of ready to use solution.
  12. dave slagle

    Anti Skating?

    I see no spot for the age of the damper in the formula used for low frequency cartridge resonance. Sure, as a damper ages its properties may change. This change would be included in the compliance part of the formula and should not invalidate it. In fact *if* the formula is to be trusted, this...
  13. dave slagle

    Anti Skating?

    the math says that doubling the mass should 1/2 the Fres and in my experiences I have yet to see this happen. the Korf audio guy found the same thing but in his case he changed the compliance. http://korfaudio.com/blog70 dave
  14. dave slagle

    Anti Skating?

    Try this experiment: Take a situation where the calculated and measured resonant frequencies match and add weight to the headshell to double the mass and see what happens to the measured and calculated resonant point. dave
  15. dave slagle

    The pure analogue LP purveyors, in order of excellence in presence

    to get back on topic. I believe the above requirement excludes anything that had been cut on a Neumann cutting lathe without the MT-75 or similar console since the preview to set the groove pitch is analog but then the signal is digitally delayed and then fed to the cutterhead. The MT75 has...
  16. dave slagle

    Tonearm height & SRA misconception

    I am conceptually having a problem with how a change in tonearm height can cause a rotation around the suspension point. You suggest that the increase in tonearm height causes a difference between ?AS1C1 and ?AS2C2 but I do not see that happening since the tonearm pivot will also adjust to...
  17. dave slagle

    Your All Time Favorite Preamplifiers?

    The last line of the chart had the linear / non-linear labels reversed and contradicted the linked text so I uploaded a new image deleting that line.
  18. dave slagle

    Your All Time Favorite Preamplifiers?

    The whole phase of the current for inductive circuits is a fairly large technical cliff that would hijack this thread. If you are going to throw inductors and transformers off that cliff you also have to include capacitors since they they have the same type of relationship. Good luck building...
  19. dave slagle

    Your All Time Favorite Preamplifiers?

    The basic litmus I use for active vs. passive is power. Active devices require an external source of power to operate and passive devices do not. That is overly simplistic and some passive devices fail the test once you get beyond electronic parts. The chart below from here pretty clearly...
  20. dave slagle

    Your All Time Favorite Preamplifiers?

    They are no more active than any other inductive device.
  21. dave slagle

    Your All Time Favorite Preamplifiers?

    This is only correct when the AVC / TVC is used at unity. The very nature of an autoformer or transformer converts excess voltage into available current. 6dB of attenuation results in roughly 1/4 the output impedance and 4X the available current. 12dB nets you 1/16th the output Z or 16X...
  22. dave slagle

    EMIA LR Phono Corrector (review)

    Hello All.... Mike... thanks for the kind words. I do want to make it clear that the units we sold 10 years ago at $4,200 were completely different than the current LR offering. Our first units used capacitors for the RIAA EQ and had a capacitor coupled output so any type of silver option...
  23. dave slagle

    Turntable setup advice needed for newbie with top cartridges

    I would reach out to J.R. Boisclair who is a forum member and is reasonably close to the bay area.
  24. dave slagle

    Koetsu

    mtemur, A few things need to be made clear from Anil. First, from his pictures I see the issue is not overhang but the maximum possible cartridge rotation is severely limited but the cartridge mount nuts. The pictures do not show the cartridge in the proper position on protractor and simply...
  25. dave slagle

    Koetsu

    Anil, They are simply called threaded inserts. The amazon link in my above post takes you to an assortment for $12. The forum software does not make the clickable link very obvious so it is included below. Threaded Inserts
  26. dave slagle

    Koetsu

    Hey Anil, I have also run into this with the schröders. I can't tell what the head of the mounting screw looks like but if you invert them you may get a little more rotation. What you really need is mounting screws with a nut like the one pictured below. I have also had good luck using...
  27. dave slagle

    Ordering a Bokrand Tonearm

    I agree... I received my arm in a timely manner and three friends have also receiver theirs. dave
  28. dave slagle

    Grado Aeon 3 - SUT or not?

    For a SUT to work with that cartridge two things would need to be considered. First assuming a 47k? input impedance to the phono, in order to adhere to the 10k? maximum load a 1:2 ratio would be the highest ratio you could use. Since the recommended load is typically a very soft number I...
  29. dave slagle

    Supersense Mastercut Edition Lacquers

    The question that needs to be addressed here is what is the actual source material that the lacquers are cut from? They say master tapes, but I find it quite unlikely that any owner of a master tape would let them be played 1:1 for each lacquer. dave
  30. dave slagle

    Help needed: Question about the impedance on an SUT?

    This becomes a tough one. I use resistors soldered to a RCA jack into an additional RCA socket in parallel with the primary of the SUT. In a pinch for experimentation a Y-connector can be used to allow the extra jack for the load resistor. I know this introduces another set of connections at...

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