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Thread: H851 contacts

  1. #1

    Question H851 contacts

    I was wondering is anyone has an idea for replacement contacts in the H851.

    I have this connector and I restored two others with contacts of
    this one (which was missing contacts already).

    H851 contacts.jpg

    I would love to get this one complete again too.
    (And if this one is complete I still need one more H851)

    Regards, Roland
    WTB: Dec TU56 / Case for Altair 8800

  2. #2
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    Quote Originally Posted by Roland Huisman View Post
    I was wondering is anyone has an idea for replacement contacts in the H851.
    Ronald,

    Can you take the pins out of an H803 and use them?

    Lou

  3. #3

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    Hello Lou,

    Are these H803 the wire wrap versions?
    They will probably fit, but I don't have these either...

    Regards, Roland
    WTB: Dec TU56 / Case for Altair 8800

  4. #4
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    Roland
    This may be of help? he has a few of these according to its ebay listing. item no. 111490206240

    .....Harry

  5. #5

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    Quote Originally Posted by harry View Post
    Roland, This may be of help? he has a few of
    these according to its ebay listing. item no. 111490206240 .....Harry
    Hi Harry,

    Thanks, and yes I've seen them. But when I buy one it will cost
    me 100 Dollars total with shipping and customs... Just for one H851
    Thats is the problem when the nice stuff is in the US and I'm in Europe...

    As escape I could use these single connectors and put two on a new H851 PCB.
    But somehow I prefer to keep them together with the wire wrap board...
    DSC05015.jpg

    Regards, Roland
    WTB: Dec TU56 / Case for Altair 8800

  6. #6
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    Roland,

    Send me a PM with your postal address and I will send you a wire wrap H803. It may take a little while to cross the pond, but may be worth the wait. Some of the pins were soldered to for bussing, but I think it can all be cleaned up for pin extraction.

    Maybe you have an extra M993 replica? I too have an RK8E/RK05 project awaiting my attention, with no M993 in hand.

    Lou

  7. #7

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    Hello Lou,

    Great! I will sent you an PM. I've got a few more M993 ordered.
    So when you give me your address I will sent you one once I have received them myself.

    Regards, Roland
    WTB: Dec TU56 / Case for Altair 8800

  8. #8
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    Folks,

    Roland told me that he couldn't find any good photos of H803 blocks. Here are some glamour shots of an H803 when I dug some out to send to Roland:

    http://www.vcfed.org/forum/album.php...chmentid=47977
    http://www.vcfed.org/forum/album.php...chmentid=47976

    This block was made by GTE Sylvania. There is a tiny triangle S lightning bolt logo in the middle front of the block. Perhaps this is not surprising since Sylvania was also a Massachusetts company.

    Lou

  9. #9

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    So while waiting for other stuff, like color pigment for the
    Dec handles and the M993 PCB's, it was time to give a bit
    attention to the H803 which I got from Lou.

    While watching at the H803 I saw 4 H851 in it...
    So I removed the power distributors of the H803.
    01 H803 to H851.jpg

    With a friend we put it at the milling machine with a 0.8mm thin circular saw.

    02 H803 to H851.jpg

    Unfortunately a thin circular saw has a disadvantage that it want to go it's own way.
    So one of the four blocks was damaged in the end. But no problem, I still have
    one H851 to fix as well... From an earlier project I still had a few H851 spare PCB's

    So that was a H803...
    03 H803 to H851.jpg

    To get all the pins at the same height I put two PCB's on top of it. Then cut all the pins.

    04 H803 to H851.jpg 05 H803 to H851.jpg

    From the last H803 part I got a few pins out and put them into the defective H851.

    06 H803 to H851.jpg

    To have a good solder joint we have sandblasted the pins.
    Somehow these old pins are hard to solder after these years...
    But after sandblasting it solders just like new copper wires...

    From left to right, three H803 parts, one restored H851 abd at the right an original H851
    07 H803 to H851.jpg

    I think they look great on my Plessey RK8E interface clone
    08 H803 to H851.jpg

    Thanks Lou!

    Regards, Roland
    Last edited by Roland Huisman; October 2nd, 2018 at 12:14 PM.
    WTB: Dec TU56 / Case for Altair 8800

  10. #10
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    Roland,

    Beautiful work! I imagined that the original H851 was likely made by splitting an H803 into quarters as you have done. Not only did you restore the original item, but created three more!

    How exactly did you remove the pins from the phenolic block? They look molded in.

    Lou

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