Beezar Audio/ECP Audio History

Discussion in 'Beezar' started by TomB, Oct 26, 2018.

  1. gixxerwimp

    gixxerwimp Professional tricycle rider

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    That's what I thought it might be, but I've seen "DSHA" referred to like a a specific design or topology that @dsavitsk created. Anyway, I'll substitute it in my head with "Doug's Secret Sauce" when I come across it in future.
     
  2. Cspirou

    Cspirou They call me Sparky

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    I've seen it written somewhere, but DSHA generally refers to an input transformer to split the signal and a differential SS buffer of some sort which goes to a transformer output(or not for the DSHA3-F)

    He also has a super spetial Copenhagen amp which is like DSHA but with an extra stage and all sorts of over-the-top extras
     
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  3. TomB

    TomB MOT: Beezar

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    You're both correct, I believe. The 3F outputs directly, without transformer-coupling. Thus, the amp cannot be used with single-ended headphones or a balanced to single-ended adapter. Or else, a direct short will result.

    The T4 uses tubes in a long-tail pair arrangement to split the signal into differential components, then the solid-state buffer is fully differential until the output transformers, effectively making the T4 a tube-based, DSHA.

    Doug will have to confirm, but I think with solid-state DSHAs, he sometimes uses input transformers to split the signal into differential components, but I think sometimes he uses FETs in a long-tail pair, too.
     
    Last edited: Jul 5, 2019
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  4. TomB

    TomB MOT: Beezar

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    Reading back further in the thread, Doug discovered the usefulness of the DSHA topology with his HPDAC 5. In its simplest terms, it is a differential circuit. However, what Doug is sometimes reluctant to add are the many tweaks he has added, not the least of which is his work with transformers. Doug's designs represent the cutting edge of transformer applications in headphone audio.
     
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