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    SP 9 12X4 tube socket

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    TN Allen

    Posts : 124
    Join date : 2013-01-01

    SP 9 12X4 tube socket

    Post by TN Allen on Thu Dec 19, 2013 3:22 pm

    I am assembling an SP 9 PCB and find one pin missing in the 12X4 socket, is this usual?

    Bob Latino
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    Join date : 2008-11-26
    Location : Massachusetts

    Re: SP 9 12X4 tube socket

    Post by Bob Latino on Thu Dec 19, 2013 3:45 pm

    That empty place on the socket is normal and is the "keyway" of the socket. It is there so that you can only insert the tube one way.

    Bob


    Last edited by Bob Latino on Thu Dec 19, 2013 4:03 pm; edited 1 time in total

    TN Allen

    Posts : 124
    Join date : 2013-01-01

    Re: SP 9 12X4 tube socket

    Post by TN Allen on Thu Dec 19, 2013 4:02 pm

    Sorry, I should have been more specific.

    It's not the space between pins 1 and 7, it's that one of the metal inserts that accept the tube pins is missing, in other words, there are 6 metal inserts in the 7 pin socket. If I am reading the layout correctly, pin insert # 1 is missing.

    Bob Latino
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    Re: SP 9 12X4 tube socket

    Post by Bob Latino on Thu Dec 19, 2013 4:16 pm

    Ok - I understand now .. On a 12X4 > pins 2 and 5 are not used so whether there are pins or not in the 2 and 5 positions on the socket won't matter > but pin #1 is used on that tube so it should be there. See photo below which shows how the pins on a 12X4 are used .....

    Bob



    TN Allen

    Posts : 124
    Join date : 2013-01-01

    Re: SP 9 12X4 tube socket

    Post by TN Allen on Thu Dec 19, 2013 4:33 pm

    Looking at the bottom of the socket, as in the orientation you show underscored by "B7G", that is with the key space at "6" O'Clock, the metal insert at "7 O'Clock" is missing. This is part of a kit Mr. Mottram sent to me. I am in the process of ordering tubes from TubeDepot and can order a ceramic 7 pin socket if that is acceptable.

    Bob Latino
    Admin

    Posts : 2377
    Join date : 2008-11-26
    Location : Massachusetts

    Re: SP 9 12X4 tube socket

    Post by Bob Latino on Thu Dec 19, 2013 4:58 pm

    Ok then a vital pin is missing ... Just notify Roy directly and I am sure that he wil just send you another socket ..

    Bob

    TN Allen

    Posts : 124
    Join date : 2013-01-01

    Re: SP 9 12X4 tube socket

    Post by TN Allen on Thu Dec 19, 2013 5:26 pm

    I've ordered a ceramic socket, but it appears I could easily move pin 2 or 5 to the "1" position.

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