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The Stax Thread III

Discussion in 'High-end Audio Forum' started by currawong, Aug 20, 2013.
  1. PointyFox
    That was very helpful, thanks!
  2. Magol79
    I'm looking into a desktop solution. This would be mainly for my L700, but I also want it to be somewhat capable at driving the 009 and 007 mk2. My question is: how good/bad is the srm-d50 compared to something like the kgsshv?
    Zoide likes this.
  3. wink
    How good is spam compared to a nice bacon rasher...?
    Jones Bob likes this.
  4. Magol79
    Since almost no one on this board seems to have heard the SRM-D50 I'd appreciate any actual impressions of it, especially in comparison to the lower KG designs, i.e. KGSS/KGSShv.
    If anyone has insights into the technical merits of the SRM-D50, that would also be helpful. Does it have a regulated psu? How is the output stage designed?

    I'm a beginner when it comes to understanding electrostatic headphone amplifiers, but I would like to better understand what choices Stax made when they built this unit.
    Last edited: Nov 14, 2018
    Zoide likes this.
  5. PointyFox
    Some pictures of the inside of the SRM-D50
    img_1811.jpg img_1812.jpg img_1810.jpg
    Rhamnetin, Zoide and Magol79 like this.
  6. kevin gilmore
    The D50 is identical to the srm717 design, simplified greatly (single output transistors) and running at lower voltages and lower output stage current.
    resistor current sources for 3rd stage voltage gain stage.
    The high voltage supplies are not regulated. The +/-15 are 3 terminal regulators as is the low voltage for the dac board.
    the amplifier is actually balanced input, but the minus input is grounded, the pot is a 2 section and the inputs are rca unbalanced only.
    Last edited: Nov 14, 2018
    purk, Zoide, alota and 2 others like this.
  7. Magol79
    Thank you, concise and informative. It's off my list for now. I will probably go with something from Spritzer instead, he has some nice compact builds.
  8. PointyFox
    Huge difference in price though.

    Also, can anyone explain what KG said?
    florence likes this.
  9. astrostar59
    Basically the D50 is a very simplified design with less performance. I would say with confidence no Stax made amplifiers get to the levels of the KGSS, KGSShv (your amp) Carbon or BHSE. So in other words IMO forget Stax amps, and source a nice KG amp built by a good DIYer.
  10. PointyFox
    I have a D50 and it already provides a ton of bass. What kind of improvement is typical going from a Stax to a KG amp?
  11. astrostar59
    It's not 'just' FR. It is dynamics, timbre, detail without harshness or edge, more realistic tonality, wider soundstage. I have had 3 previous Stax amps and heard most of the units pre 2014, and they are IMO dynamically restricted in comparison. Less so on the 009, as that is less hungry than the 007, but the 009 on my SRM-717 was cold and clinical sounding to my ears.

    Can you try find an owner near you to try a KG amp out? If I was going back to Stax and had the budget, I would buy the BHSE and have done with it, you can always return it if not amazed....
  12. Zoide
    That's interesting. Just a few pages back, people were raving about the tiny STAX D10 amplifier, and now I'm hearing that the legendary SRM-717 is cold and clinical, while the newer D50 has an inferior design :astonished:
  13. PointyFox
    My 007A with D50 is anything but cold and clinical. I wouldn't mind it being a bit more.
  14. purk Contributor
    Because the 007/009 are so good and very transparent, any improvement in amplification will be easy to discern. I'm very happy listening to the D10 but my big rig is still a whole lot better.
    HoloSpice likes this.
  15. PointyFox
    The Law of Increasing Returns?

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