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

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

  1. Cadillac Kid

    Cadillac Kid Addicted Member

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    I bought it a long time ago at an electronics flea market. I don't think it was modified, it looked factory with rivited XLRs. I would guess that it was made in the late 1970's?

    I made adapters for it, then dumped it for a 367.
     

     

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  2. Cadillac Kid

    Cadillac Kid Addicted Member

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    Last edited: Aug 17, 2016
  3. Pio1980

    Pio1980 AK Member Subscriber

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    Did they ship with XLR cables supplied by Mac?
     
  4. c_dk

    c_dk Addicted Member

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    This should get all excited......Mc7200 and MC7300 schematics show balanced XLR pin 2 driving a 5532 differential IC pin 2 amp which of coarse is a - input. XLR pin 3 which is labeled - drives the + input of the same IC. So for all you phase inversion followers......Does it invert phase?

    Well since the output of that 1/2 of the IC drives the - of the other 1/2 of the IC I guess not.........but then again I was taught the beauty of balance connections happened in the transmission line itself not some miracle inside the electronics. Think long 50-100 meter microphone runs and such.
     
  5. whoaru99

    whoaru99 Epic Member

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    Arguably, the miracle does happen in the electronics with the rejection of common mode noise by the differential amp.
     
  6. ron-c

    ron-c AK Subscriber Subscriber

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    C35 was built both ways. This is a standard XLR connector which you can change if you so chose.

    Thanks,
    Ron-C
     

     

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  7. kevzep

    kevzep Its all about the Music Subscriber

    But why Ron, why did Mc not follow convention? Just curious.....
    Yeah, you could very easily pop those females out and slip some males in....
     
  8. ron-c

    ron-c AK Subscriber Subscriber

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    That was not settled in the mid 80's as stated by others.

    Thanks,
    Ron-C
     
  9. kevzep

    kevzep Its all about the Music Subscriber

    Odd, I've been an audio engineer since the early '80s and every bit of gear I had or used back then followed convention as we know it now....
    But, yes it was early days so perhaps it hadn't filtered through the whole industry at that point...
    I find it interesting....So are you saying the customer could just specify what gender they wanted? At least it was an option...
     
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  10. 4-2-7

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    The the pin wiring may not have been, but the direction of In & Out with the locking XLR certainly was. The way mac did the female out would severely reduce compatibility with most other power amps and anything else forcing the use of RCA if at all possible.

    I'm glad this came up because buying used stuff, I wouldn't think at a glance that the XLR would be of no use at all for me.
     
  11. whoaru99

    whoaru99 Epic Member

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    It's not a show stopper.

    http://www.markertek.com/product/sc...3-pin-xlr-male-to-3-pin-xlr-male-3-foot-black

    or

    http://www.markertek.com/product/na...male-to-3-pole-xlr-male-audio-adapter-coupler
     
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  12. Cadillac Kid

    Cadillac Kid Addicted Member

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    In the mid 80s I had one of those 'pin 2 hot/ pin 3 hot' spin the wheel joke freebies from the NAB convention, but I thought signal direction was settled long before that.
     
    Last edited: Aug 22, 2016
  13. whoaru99

    whoaru99 Epic Member

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    AES adopted pin 2 hot as a standard in 1992.
     
  14. 4-2-7

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    It would be if I wanted a new mac amp to go with my old preamp and use XLRs.
     
  15. whoaru99

    whoaru99 Epic Member

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    As I posted, there are male-male cables or adapters.
     
  16. Mike Gibson

    Mike Gibson Modulator Staff Member Super Mod Subscriber

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    This thread belongs in the M.A.A.N. file Much ado about nothing. :) Just kidding, carry on with the flogging. The horse doth twitcheth yet.
     

     

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  17. 4-2-7

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    I don't like adaptors, I like short signal paths with the least amount interference and corruption to the signal. Then you have the fact of buying nice equipment, cabling and stick a cheap adaptor in the mix. I know, one can adapt away stringing tons of gear together and have a cabling nightmare that's a magnet to RFI noise. That's never been my goal, and if the C100 wasn't so good at staying out of the way, I'd be Passive Pre at this point.
     
    Last edited: Aug 21, 2016
  18. 4-2-7

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    Hey I think it's interesting and something I didn't know about and to look out for.;)
     
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  19. Cadillac Kid

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    I guess McIntosh was not an 'Early Adapter' of the de facto standard. Just checked my Mc2102, no Markertek same gender patches in place. Whew.
     
    Last edited: Aug 21, 2016
  20. whoaru99

    whoaru99 Epic Member

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    I know for a fact Cardas will reterminate cables. And, I'd guess most high end cable mfgs would as well, or whip up a pair. If the Mogami, Belden, or Canare isn't good enough.

    Point is, there is nothing material stopping one from doing it. The only road block is in the mind.

    Or, failing all that, have the females replaced with males. Easy peasy.
     
    Last edited: Aug 21, 2016

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