LL5607 is a C-core line output transformer designed for Calrec Audio, probably used as a 1.5 : 1 transformer. 
LL5607 has an internal Faraday shield and a mu metal housing.


Pin configuration (as seen from PIN side)    
6,  5,  4,  3,  2,  1              




12, 11,     9, 8,  7      

Usage (1.5 : 1):    
in+	pin 1  
in- 	pin 4  
connect  pin 6 + 3    

out+	pin 7  
out-	pin 11  
connect pin 12+8  

Faraday shield + housing pin 9