Why did McIntosh use Female XLR jacks as output connections on some preamps?

Discussion in 'McIntosh Audio' started by Thinker, Aug 15, 2016.

  1. Lesterbest

    Lesterbest Super Member

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    Does this increase the value, like improperly minted coins?
     
  2. kevzep

    kevzep Its all about the Music Subscriber

    Well, all the Mc gear I have with XLR's follows convention which makes me think this could be an error....

    Well depending on the type and style of XLR used, the hole size is different from male to female as well, so when the panel was pressed, it may have been pressed with the wrong hole.....who would know, its a strange anomaly thats for sure.
     
  3. whoaru99

    whoaru99 Epic Member

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    Or, maybe, a previous owner had the unit modified/changed.

    What is the history of Backwards Jack?
     
  4. kevzep

    kevzep Its all about the Music Subscriber

    I might do, unless they did a whole run like this and swept the error under the mat.....
     
  5. whoaru99

    whoaru99 Epic Member

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    Seems a call to Mc might bottom it out...unless one of the crew chimes in.
     
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  6. 4-2-7

    4-2-7 Smart Ass Sponsor Subscriber

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    A customer could have changed it to fit some goofy Chinese amp or the likes, and or ordered it that way, but it really is still wrong and would need adapters to work for others.
     
    Last edited: Aug 16, 2016
  7. petehall347

    petehall347 the brandy coffee man

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  8. kevzep

    kevzep Its all about the Music Subscriber

    If you look at the pics on the first page, it seems there is another one apart from the OP's one which has this.
    Looks like they use the Neutrik connectors that use the same hole size for male and female...
    Maybe they ran out of males on that run....lol....

    Yeah I'd call up McIntosh, I reckon they would change them to males for no charge......
     
  9. kevzep

    kevzep Its all about the Music Subscriber

  10. petehall347

    petehall347 the brandy coffee man

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    maybe they changed at at a certain serial number .
    lower number in the pics shows female so maybe they realised somewhere between those numbers ..someone on the end of a phone might know ..or send some leads out for free .
     
  11. damacman

    damacman Blown and Injected Subscriber

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    Wow. Wasn't the C35 the first Mc pre with XLR outputs? Maybe the first few dozen units were shipped that way before they caught the error.

    I'm sure ron-c, c_dk, or twiiii would recall.
     
  12. Johnny_Law

    Johnny_Law AK Member Subscriber

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    Edit: nevermind!
     
  13. kevzep

    kevzep Its all about the Music Subscriber

    Yeah thats what I think it might be too....
     
  14. damacman

    damacman Blown and Injected Subscriber

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    Now, if that C35 also had Male RCAs on the rear panel . . . that'd be something.
     
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  15. Thinker

    Thinker Super Member

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    I'll give them a call and see what I can findout
     
  16. c_dk

    c_dk Addicted Member

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    Do a wiki search for Canon XLR.......until 1990 or so there were few worldwide standards that followed Jim Canon's early design. European, Japanese, and American manufacturers followed their own national conventions.

    The many footnotes are interesting tidbits highlighting the confusion.

    The C35 was the first Mac with Canon outputs, as we called them back then, that I can remember. The MC7100,7200, and 7300 were the first amps.

    Pin 3 hot was a American tradition, while pin 2 was Europes choice. While the male pins pointed towards the signal flow for some, many Japanese manufacturers insisted they should go the other way.

    Mac must have changed the connectors to follow the AES published standards that came out in the middle of the preamps production run, sometime in 1990. If I get some time tomarrow I will pull the amp and preamp schematics and see what pin is "hot".
     
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  17. kevzep

    kevzep Its all about the Music Subscriber

    I still have to correct myself and call them XLR's, because I still tend to call them canon....the young folk have no idea what I am talking about!!

    I have been around XLR pro gear since the '80s and I have never seen Japanese gear following anything other than Male=output convention....

    However in New Zealand here we used American, UK and Japanese gear which was always a challenge amalgamating pin 3/pin 2 standards!!

    Would be interesting to see what McIntosh's reasoning was.........I'm betting McIntosh is pin 2 hot.
     
  18. VintageMac

    VintageMac McIntosh Junkie Subscriber

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    Well, I don't know why the male outputs were used, but it was not a mistake and it was not an anomaly. Nor a special order nor consumer DIY change.

    The early C35's were made with male outputs. And concurrently, the C36 (export), C37 and C38 also used the male XLR outputs. It looks like late production C35 and then later pre-amps were produced with female outputs.

    C36:
    [​IMG]

    C37:
    [​IMG]

    C38:
    [​IMG]
    Larry
     
  19. Cadillac Kid

    Cadillac Kid Addicted Member

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    I had a Shure M67 with male mic inputs. . Never understood why they did this.
     
    Last edited: Aug 16, 2016
  20. kevzep

    kevzep Its all about the Music Subscriber

    Just did a bit of research, all the images I could find of the M67 showed Female XLR mic inputs....perhaps yours was modified?
     

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