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Atma-Sphere tape EQ option

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  • #1

    Atma-Sphere tape EQ option

    We've not offered a stand-alone tape section, but a number of customers have asked if it was possible to add tape EQ to our phono sections. It was.

    Usually we have the EQ set up for IEC at 7.5/15 ips. This option is available on our MP-1 and MP-3 preamps equipped with a phono section. We usually add an additional input on the rear panel (balanced of course but with tubes; we were the first to do balanced doncha know) and add the additional switching to the front panel.
    Tags: atmasphere audio, reel to reel
  • #2
    Make this throwback Friday! Just like the old McIntosh preamps!
    Myles B. Astor, PhD, Administrator
    Senior Editor, Positive-Feedback.com
    ________________________________________

    -Zellaton Plural Evo speakers
    -Goldmund Telos 440 and 1000 Nextgen mono amps
    -Goldmund Mimesis 37S Nextgen preamplifier
    -Doshi EVO and Goldmund PH3.8 phonostage
    -VPI Vanquish direct-drive turntable
    -VPI 12-inch 3D Fat Boy dual pivot tonearm, VPI 12-inch 3D Fat Boy gimballed and SAT LM-12 arm
    -Lyra Atlas SL Lambda, vdh Colibri Master Signature, Mutech Hayabusa,
    -Technics RS1506 with Flux Magnetic heads, Doshi V3.0 tape stage (balanced)
    -Assorted cables including Skogrand, Kubala-Sosna, Audience FrontRow; Audience FrontRow, Genesis Advanced Technologies , Goldmund and Ensemble Power Cords
    -Accessories including Stillpoint Aperture panels, Cathedral Sound panels, Furutech NCF Nano AC receptacles; Silver Circle Tchaik 6 PLC, Symposium ISIS and SRA Craz 3 racks, Audiodharma Cable Cooker, Symposium Ultra and assorted SRA OHIO Class 2.3+ platforms.

    Comment

  • #3
    Ralph, IMO what the world needs now are more tape preamp options, not that good ones don't already exist. How about a stand alone pre with IEC and NAB curves, front panel eq adjustment and user adjustable gain options...maybe built in line xfmrs for balance out?

    Comment

    • Bruce B
      #3.1
      Bruce B commented
      06-01-2017, 12:06 AM
      Editing a comment
      Sounds like the Doshi unit I'm using now!!
  • #4
    Very interesting preamp. I am using a preamp designed by my good friend the late Allen Wright, who's concepts were very similar to this preamp. I built this as a prototype 15 years ago, and retired it after I received a production unit. After modifying it for tape Eq, I was astonished by how good it sounded. I truly believe balanced differential design with tight regulation (shunt PS regulators and constant current sinks) is the way to go.
    • Likes 1

    Comment

    • #5
      Originally posted by adrianwu View Post
      Very interesting preamp. I am using a preamp designed by my good friend the late Allen Wright, who's concepts were very similar to this preamp. I built this as a prototype 15 years ago, and retired it after I received a production unit. After modifying it for tape Eq, I was astonished by how good it sounded. I truly believe balanced differential design with tight regulation (shunt PS regulators and constant current sinks) is the way to go.
      What machine are you using?
      Myles B. Astor, PhD, Administrator
      Senior Editor, Positive-Feedback.com
      ________________________________________

      -Zellaton Plural Evo speakers
      -Goldmund Telos 440 and 1000 Nextgen mono amps
      -Goldmund Mimesis 37S Nextgen preamplifier
      -Doshi EVO and Goldmund PH3.8 phonostage
      -VPI Vanquish direct-drive turntable
      -VPI 12-inch 3D Fat Boy dual pivot tonearm, VPI 12-inch 3D Fat Boy gimballed and SAT LM-12 arm
      -Lyra Atlas SL Lambda, vdh Colibri Master Signature, Mutech Hayabusa,
      -Technics RS1506 with Flux Magnetic heads, Doshi V3.0 tape stage (balanced)
      -Assorted cables including Skogrand, Kubala-Sosna, Audience FrontRow; Audience FrontRow, Genesis Advanced Technologies , Goldmund and Ensemble Power Cords
      -Accessories including Stillpoint Aperture panels, Cathedral Sound panels, Furutech NCF Nano AC receptacles; Silver Circle Tchaik 6 PLC, Symposium ISIS and SRA Craz 3 racks, Audiodharma Cable Cooker, Symposium Ultra and assorted SRA OHIO Class 2.3+ platforms.

      Comment

      • #6
        I am using a Nagra T Audio.
        • Likes 1

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        • #7
          Originally posted by Rob View Post
          Ralph, IMO what the world needs now are more tape preamp options, not that good ones don't already exist. How about a stand alone pre with IEC and NAB curves, front panel eq adjustment and user adjustable gain options...maybe built in line xfmrs for balance out?
          We are considering a high gain unit that is designed for phono and tape with multiple inputs and EQ curves. No need for those pesky output transformers when we can direct-couple it though

          Comment

          • #8
            Originally posted by atmasphere View Post

            We are considering a high gain unit that is designed for phono and tape with multiple inputs and EQ curves. No need for those pesky output transformers when we can direct-couple it though

            Comment

            • #9
              Cathode follower output stage? Are you planning on passive eq, which should be easy to implement in a differential design?

              Comment

              • #10
                More than likely it would have our direct-coupled output. Phono sections do seem to be more stable with passive EQ.

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