Hello-    I am considering converting an R-390 IF module to fit into an R-390A 
mainframe. I have some info on this but have seen posts that a schematic for 
the actual Servo Corporation Series 500 IF module exists. I have searched for 
one to no avail.     I was hoping to find this schematic to compare it to the 
R-390 IF module and aid in the conversion.     Also, I would like to add any 
R-725 technical info that is available to my files here in order to study.     
Will pay any costs incurred if copying is required.Thanks all,Byron W5FH
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