1. Time for some upgrades in server hardware and software to enhance security and take AK to the next level. Please contribute what you can to sales@audiokarma.org at PayPal.com - Thanks from the AK Team
    Dismiss Notice

Transistor part# 043-924 (photo)

Discussion in 'McIntosh Audio' started by lowredmoon, Apr 15, 2018.

  1. lowredmoon

    lowredmoon Active Member

    Messages:
    148
    Location:
    Central Pennsylvania
    If you have any knowledge about this transistor, please share.
    I have a set of these that came out of an MC2105. I'm trying to ID them beyond the Mc part number. If they're original to an MC2105, they should be suitable for my Mac1900, but I don't have enough data to be comfortable with that.

    I've searched the Web quite a bit, and have found no reference.

    Thank you for your input.
     

    Attached Files:

     

    Please register to disable this ad.

  2. c_dk

    c_dk Addicted Member

    Messages:
    6,237
    Location:
    West Michigan
    043 would be the last 3 digits of a Mac part number.....132-043 for a output transistor.

    I do have to question why someone would care to reuse a 40 year old transistor with a questionable history when a modern replacement is available from dozens of suppliers. The onsemi 15003 has been used as the go to replacement for over a decade.

    Replacing all in the affected channel is wise.
     
  3. lowredmoon

    lowredmoon Active Member

    Messages:
    148
    Location:
    Central Pennsylvania
    A fair question. It's simply an attempt to keep things near-original. I admit - more of a pursuit of fancy than logic.
    Thank you for resolving the part number question.
     
  4. lowredmoon

    lowredmoon Active Member

    Messages:
    148
    Location:
    Central Pennsylvania
    I have options.
     

    Attached Files:

  5. clinic-audio

    clinic-audio all on YAMAHA untill 1990

    Messages:
    2,179
    Location:
    France
    c-dk has very well explained
    070-xxx are diodes
    131-xxx are triac or dias
    132-xxx are transistors
    133-xxx are IC's
    when you read "043" you should immediately understand "132-043"
    This is an official MCINTOSH part number
    132-043 is no longer available since 30 years and replaced by 132-070
    132-070 is 2N5303 NLA since a long time too and replaced by 132-188
    132-188 (made by RCA) is now a MJ15003
    If you have to replace TR you should replace all by the same model in once , same for the other polarity (132-189 = MJ15004)
     
    Hipocrates likes this.
  6. lowredmoon

    lowredmoon Active Member

    Messages:
    148
    Location:
    Central Pennsylvania
    Thank you for clarification, Patrice. I'm surprised I didn't catch that.
    I replaced all four transistors with McIntosh supplied MJ15003G. It runs much cooler now, and unless I'm imagining it, the sound is more balanced.
    This is my first "Mac," and I'm in love with the sound! 20180415_180529.jpg 20180414_202933.jpg
     
    Hipocrates likes this.

     

    Please register to disable this ad.

  7. clinic-audio

    clinic-audio all on YAMAHA untill 1990

    Messages:
    2,179
    Location:
    France

Share This Page