"Shortest Way" SW51 Amp Impressions (Simple SET Amp)

Discussion in 'Headphone Amplifiers and Combo (DAC/Amp) Units' started by Hands, Jul 12, 2019.

  1. Zampotech

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    I assume that the cost of these amps should not exceed $800. Of course, this is unfortunately much more expensive than the SW51.
    I don't have as fine a hearing as many users here, but the measurements of these amplifiers showed slightly better results than the SW51 in THD and power. In addition, a step-by-step attenuator on low-signal relays will provide an almost eternal volume control. The resource of these relays is very large.
    I will be happy to provide a sample of any amp for detailed testing, measurement, and artistic rape to the measurement virtuoso @atomicbob
     
  2. Lycos

    Lycos Acquaintance

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  3. Zampotech

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    IEM headphones are dynamic, only SW4 is suitable for them. SW9 will be redundant.
     
  4. gixxerwimp

    gixxerwimp Professional tricycle rider

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    What characteristics of the design of the SW4 and SW9 make them suitable for dynamics and planars respectively? What impedance range for each type of headphone are you optimizing for? There's a wide range in the the behaviour of dynamic heaphones. I find the low and high Z outputs of the SW51 make them suitable for low and high Z dynamic headphones respectively.
     
  5. Zampotech

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    Planar headphones require more amp power, so the SW9 will be equipped with a powerful 6P9 tube.
    This tube is chosen because it provides the necessary power at low THD.
    The SW4 will be equipped with two outputs, low-resistance and high-resistance.
     
  6. creuzabar

    creuzabar New

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    Zampotech friend could you take me a question? I'm sorry if it's been answered somewhere and I haven't heard.
    I would like to know the power of sw51 to power headphones of 300 ohms, how many mw it produces at 300 ohms?
     
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  7. gixxerwimp

    gixxerwimp Professional tricycle rider

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  8. Zampotech

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    The power on the headphones of 300 ohms is negligible. At a volume of "brains fly out through the nose" probably 20-30 milliwatts
     
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  9. tommytakis

    tommytakis MOT: E.T.A Headphones

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    @Zampotech are either amps going to be run in ultralinear mode? Or triode strapped pentode like sw51?
     
  10. Zampotech

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    Both amplifiers will operate in ultra-linear mode.
     
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  11. tommytakis

    tommytakis MOT: E.T.A Headphones

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    Awesome! May i ask about the size? Do you have any pictures of the finished product?
     
  12. Gazny

    Gazny MOT: ETA Audio

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    Will the amps be available with preouts, or will they keep the simplicity of sw51?
     
  13. Zampotech

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    There are no photos of the case yet. The prototype of the case is still in the hands of a cabinet maker.

    This amplifier will have a balanced and unbalanced input. It has a headphone output and an unbalanced output that can be used as a preamp output.
     
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    Last edited: Apr 21, 2021
  14. rhythmdevils

    rhythmdevils MOT: rhythmdevils audio

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    I want an SW9 for my orthos! Very cool @Zampotech
     
  15. Erroneous

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    @Zampotech Anytime you're ready to start taking pre-orders (or even pre-pre-orders), sign me up for an SW4.
     
  16. MisterRogers

    MisterRogers Ethernet Nervosa

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    SW9 for me, I know it will be good.
     
  17. Pancakes

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    SW9 it is :)
     
  18. Sqveak

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    SW9 tentatively please :)
     
  19. Skyline

    Skyline Double-blindly done with this hobby

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    Hey all...any chance we can start new threads for the new amps? It's hard for an old man like me to keep track of. *insert grandpa emoji here*
     
  20. Friday

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    Except there's nothing to start yet. At least, probably nothing that Zampo feels is worth making a new thread over until he finishes the sw51 orders
     
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