[R-390] C603 C606 plan "B"

[frankshughes at aim.com]

Hi,


Thanks for all the replies & ideas about what to do about the missing C603 an C606 from the spare 
1967 EAC AF deck which I am trying to make functional. 





So I will go ahead and put in some new electrolytics, give up on finding any originals to rebuild.


However, obtaining the bases might not be an issue. 





I was advised that Potter & Brumfield (among others) uses the same base for some of their relays.





There is a giant electronics & other "junque" place near me, http://www.skycraftsurplus.com/


and they have piles'o pulled relays from decades past, so this week's mission is to locate some donor bases.





The last problem to resolve is: what the heck is pin 5 on the socket for C603 connected to?



It does not show up (or possibly I just can't seem to look in the correct place) in the "Y2k-REL-1" or


the "cookbook" or any other schematics that Google can locate.



In the "Y2K-REL-1" book, page 213 photo shows the red/white/blue wire on pin 5 of socket C603.
(directly above the arrow line for label "R620")

I don't want to mix up the polarity of the new electrolytics, my elmer says it would be "bad"





I can see what all the other pin-outs function and polarity are, but this one is a mystery.
Any ideas ?





Thanks,


Frank