[Collins] Wanted: Early Schematic for 75A-1

[Barockteer at aol.com]

Hi All. 
 
I have an early 75A-1 (s/n 34) which I'm working on. I have a third edition  
manual, and I strongly suspect there were factory changes around the AVC 
switch,  as there is factory wiring with red glyptal that doesn't jive with the 
manual I  have. Also, of course, there are 'mods' which I'm trying to undo...
 
Any leads appreciated!
 
73, Tony, K1KP