Transceiver chips for Peri Proc and Automation cards

Hello all, i have a reliable source for the “obsolete” and increasingly hard to find ATT 41LM (also called  LUCENT 41LM later in production) Serial driver chips. If these go bad in your automation cards …… you dont even want to know what it will cost you for the “daughter board” replacement of these chips. So… here goes. After some dodgy dealings with some Pacific suppliers who … in actuality had no supply, i found this gentleman and company who actually get the chips.

Hugh Iverson
Account Executive

Chicago Tech, Inc. /
4043 N. Ravenswood Ave.
Chicago, IL  60613
800-442-4011 Ext. 6011
773-687-6011 Direct
312-948-9486 Fax

They only have 1,100 of these chips left…. so hurry ! LOLz  two or four of these will probably last you two lifetimes. They are around $7 each for these (because they are hard to find). These Chips are robust and seldom fail, or so the story goes. Never hurts to be ready for seldom.


Also i had Harrison replace two chips in one of my peri-proc  boards ( model # SN75176BP ) that brought my serial from not working…to working. Harrison did the repair for a really reasonable sum as well…Kudos and thanks to Brian Cox @ Harrison.

I did the same replacement on all my other cards and they were repaired as well. the chips are located @ u47 and u48 on the peripheral processor boards. there are ten identical chips in the same section. Might as well replace them all since they are $.60 (thats 60 cents)  each. Heres where you get those.

I had a ground fault in my mains power that fried the chips. Good ones to know about.


  1. November 30, 2012  2:00 pm by maikol

    That is excellent info Shawn, thanks a lot !

  2. November 30, 2012  2:00 pm by Paul Svenre

    Shawn, awesome!! Thanks a LOT for sharing

  3. November 30, 2012  2:01 pm by Shawn Sullivan

    My pleasure! hopefully this saves someone a sleepless night or two in the years to come.

  4. November 30, 2012  2:01 pm by Paul Svenre

    Question: The automation cards are the Nubus cards, correct? And the peri proc are in the monitor rack?

  5. November 30, 2012  2:01 pm by Shawn Sullivan

    Yes your automation cards are the Nubus cards. The periphrial processor cards are the cards that have the little red and green lights on your monitor and execution racks as well as your control surface.

  6. November 30, 2012  2:02 pm by Paul Svenre

    Ok, so it could make sense to get a few more of those latter ones, the small $.60 ones? I have to repeat, thanks Shawn, this is a really great tip. Even if it's unlikely that those chips will fail, this is a cheap insurance.

  7. November 30, 2012  2:03 pm by Shawn Sullivan

    Your most welcome. Yes there are ten of those chips in two columns for each Peri Proc board. Harrisons' repair on my peri proc board replaced all ten of the SN75176BP chips that fixed my serial problem. So i would get 10 x "your peri proc boards" worth of those chips to have as spares. for me thats 5 peri proc boards in my execution rack, two peri proc boards in my control surface and 1 peri proc in monitor rack. So thats 80 chips. might as well make it 100 chips and get the price break at a quantitly of 100. They are only $.40 each ( 40 cents) so for $40 dollars you are covered for life. I like the sound of that "covered for life"

  8. November 30, 2012  2:03 pm by Paul Svenre

    Any of you in Europe interested in a group buy of a few 41LM chips? I'd like perhaps 15. Minimum order is 20 units. And they're suddenly $9.00... (got another seller than Shawn who started at $11.00/unit....) We probably get a better price if we go for lets say 50. I could pay for it and then distribute to you, Maikolz, Jo perhaps?

  9. November 30, 2012  2:04 pm by maikol

    Yes Paul I'm interested! Thanks for the proposal!

    I wonder how many of these would be needed to be safe forever, though ?

  10. November 30, 2012  2:04 pm by Paul Svenre

    Shawn is the expert here, but after reading his OP I'll go for 15-20 units.

  11. November 30, 2012  2:04 pm by Shawn Sullivan

    They are very robust chips, can handle loads of heat and are practically immune to esd. 2 pairs and your good for this lifetime. I bought 26 ...

  12. November 30, 2012  2:05 pm by maikol

    ha ha love that way of thinking! :-D

    Paul, please buy 10 pieces for me!

    And thanks again for your proposal!

  13. November 30, 2012  2:05 pm by Paul Svenre

    Great! Let's just wait for Jo then

  14. November 30, 2012  2:05 pm by Paul Svenre

    Ok, Jo, Maikolz and I will have ten 41LM chips each. I'll go ahead and order shortly, so if someone else want to join please let me know asap. Remember minimum order is 20 pc.

    • July 7, 2014  6:14 pm by Studjo

      Hey Paul
      did anything happen regarding these chips?

      • July 7, 2014  10:25 pm by maikol

        Good question Jo! Nothing for me so far ?

        And hey, how are you mate? :-)

        • July 9, 2014  11:35 pm by Studjo

          all great around here - will move Harry to a new home. A bit nervous about that but looking forward to the new place.
          btw is there a notification system from this site - it would be awesome to get an e-mail as soon as somebody replied to a topic :D

          • July 9, 2014  11:51 pm by maikol

            Hi Jo!

            Good to know you are well. Moving Harry should go well if you are careful, I think these babies are easier to move than an old neve for example. Don't forget to check that no chip are well pressed in their socket after the move, road vibrations can get them out enough to have problems.
            I remember having had this the first time I installed the console, after it had travelled from UK to France on a truck. Many of the thin chips on the channels (those blue ones that only have one line of pins) had gotten partially out of their socket, giving all sort of problems).

            About notifications, you should get one for every new post on a topic you have responded on, or on any new comment on article you've commented on. Is this what you get ?


  15. July 9, 2014  7:19 pm by Paul Svenre

    Hi guys! Hope you're ok! I got a quote back then, almost three years ago. Then when I wanted to go ahead and order they didn't respond, and after 2-3 attempts I gave up and then forgot... I've just contacted two other firms for quotes on 50 units of these. Will let you know when I get reply!

  16. September 16, 2014  4:44 pm by Craig Alvin

    These chips are very robust until you have a PS blow and it takes out all of them. Thanks Shawn for supplying me with some spares. I am going to switch out my PeriProc cards to be the ones with the new daughter board.

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