I am assembling an SP 9 PCB and find one pin missing in the 12X4 socket, is this usual?
2 posters
SP 9 12X4 tube socket
TN Allen- Posts : 164
Join date : 2013-01-01
Bob Latino- Admin
- Posts : 3263
Join date : 2008-11-26
Location : Massachusetts
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
Bob
Last edited by Bob Latino on Thu Dec 19, 2013 4:03 pm; edited 1 time in total
TN Allen- Posts : 164
Join date : 2013-01-01
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.
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- Admin
- Posts : 3263
Join date : 2008-11-26
Location : Massachusetts
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
Bob
TN Allen- Posts : 164
Join date : 2013-01-01
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 : 3263
Join date : 2008-11-26
Location : Massachusetts
Ok then a vital pin is missing ... Just notify Roy directly and I am sure that he wil just send you another socket ..
Bob
Bob
TN Allen- Posts : 164
Join date : 2013-01-01
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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