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Thread: Rare Ortofon A25/GT?

  1. #1
    Join Date: Jul 2019

    Location: Denmark, Sjaelland

    Posts: 2
    I'm Carsten.

    Default Rare Ortofon A25/GT?

    Hi
    I am Carsten from Denmark. I love vintage gear, especially old Ortofon. I mainly collect and mostly listen to streamed music :-) - Sorry!!!
    I came across this strange thing that I have NEVER seen before. Can anybody help me to identify it?
    It is mono in a bakelite head shell type G with a built in transformer. The cartride looks like a Type A25 with sappire stylus.

    Best regards
    Carsten
    Attached Images Attached Images

  2. #2
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 3,911
    I'm Tom.

    Default

    You might find more expertise on rare cartridges over on Lenco Heaven.

    Are you sure it's an A type and not a C type? Hard to tell from the very small picture. Does the headshell have two output pins or four?

    Agree it's a good idea to include a transformer in these as the standard output from the C type at least is not ideal for any MC or MM phono stage. It's not something you see often though.
    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers with Tannoy ST50 supertweeters; Amp - Silvercore 833C monoblocks; preamp TBA watch this space; Vinyl: Schopper'd Thorens TD124 MkII + Ikeda IT345-CR1 9 inch and Ikeda IT-407 12 inch tonearms; Cartridges Stereo - Miyajima Madake, Miyajima Takumi, Ikeda 9TT, vintage Ortofon SPU GE; Mono - Miyajimas - Zero 0.7, Premium 1.0, Miyajima/Edison '78' 4.0 conical, and Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage Allnic H7000V used with Miyajima ETR-Mono and ETR-Stereo SUTs; Digital: Audio Note CDT2/II transport, heavily enhanced AN DAC based on kit but aspiring to DAC5 spec.

    Study: Speakers - Tannoy DC6; Amp: Marantz PM-4; Digital: CDP Sony CDP-X3000ES & Arcam rBlink; Vinyl: Garrard 401 with AT 1503 MkI broadcast arm, Ortofon SPU Classic GM, Ortofon 2-15k SUT and Puresound Tenuto platter mat

  3. #3
    Join Date: Jan 2009

    Location: Essex

    Posts: 20,725
    I'm openingabottleofwine.

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    Clearly the generator is either the Ortofon A or Ortofon C monophonic moving-coil design fitted into the Type G headshell.



    It is not readily possible to distinguish between the A or C versions by appearance alone: the 'A' required a VTF of 7g, the 'C' required only 3.5g and was intended for professional use. The '25' denotes the diameter in um of the spherical diamond tip.
    Barry

  4. #4
    Join Date: Jul 2019

    Location: Denmark, Sjaelland

    Posts: 2
    I'm Carsten.

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    Thans for answering. I am pertty sure it is an A genarator. The "needle arm" on the C version is narrower and a bit longer than the C as far as I remember. What puzzels me most is the funny built in transformer...?
    Could it be factorymade? Or DIY?

  5. #5
    Join Date: Feb 2010

    Location: Berkshire, UK

    Posts: 3,911
    I'm Tom.

    Default

    Pointless asking Ortofon they have little interest in or knowledge of their own history.
    Main: Speakers 'RFC' Tannoy Canterburys / custom crossovers with Tannoy ST50 supertweeters; Amp - Silvercore 833C monoblocks; preamp TBA watch this space; Vinyl: Schopper'd Thorens TD124 MkII + Ikeda IT345-CR1 9 inch and Ikeda IT-407 12 inch tonearms; Cartridges Stereo - Miyajima Madake, Miyajima Takumi, Ikeda 9TT, vintage Ortofon SPU GE; Mono - Miyajimas - Zero 0.7, Premium 1.0, Miyajima/Edison '78' 4.0 conical, and Shure M44 strapped for mono with several Expert Stylus conicals for different eras of 78s; Phono stage Allnic H7000V used with Miyajima ETR-Mono and ETR-Stereo SUTs; Digital: Audio Note CDT2/II transport, heavily enhanced AN DAC based on kit but aspiring to DAC5 spec.

    Study: Speakers - Tannoy DC6; Amp: Marantz PM-4; Digital: CDP Sony CDP-X3000ES & Arcam rBlink; Vinyl: Garrard 401 with AT 1503 MkI broadcast arm, Ortofon SPU Classic GM, Ortofon 2-15k SUT and Puresound Tenuto platter mat

  6. #6
    Join Date: Jan 2009

    Location: Essex

    Posts: 20,725
    I'm openingabottleofwine.

    Default

    Quote Originally Posted by cardal View Post
    Thans for answering. I am pertty sure it is an A genarator. The "needle arm" on the C version is narrower and a bit longer than the C as far as I remember. What puzzels me most is the funny built in transformer...?
    Could it be factorymade? Or DIY?
    I don't know if the early Ortofon cartridges used an external transformer or not. Later SPUTs used an on-board transformer, made for them by the Danish transformer manufacturer Joergen Scheu; as was the external transformer: the 2-15K They have a completely different appearance to the one shown with your cartridge.
    Last edited by Barry; 24-07-2019 at 19:31. Reason: spelling
    Barry

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