[Collins] Microphone plugs on the S-Line

[Jim Isbell]

I am in need of three S-Line microphone plugs.  Oddly enough all three 
of my microphones have other types on them.  I recently got one of them 
from someone on this list and it is used on my RCA/Shure microphone. 
 Now I need three more for the SM-1, the D-10 and the D-104.  Soon I 
will be on the air.  The last job is getting the 32S-1 aligned.

What is the correct designation for this plug?  

Another question in this vein, If I am using the 312B-4 can I plug in a 
mike on both the 312B-4 and the 32S-1 and use them interchangeably (one 
for DXing and one for rag chewing with different 
characteristics)....assuming the mikes are separated enough that BOTH 
dont trigger the VOX.  Or I could turn down the VOX and just use PTT.

And a final question.  Somewhere I read of using two receivers at the 
same time.  I cant remember why.  I will be ending up with a "spare" 
75S-1 when all is said and done and I am wondering if there is any 
advantage to hanging on to it.