[Hallicrafters] Determining Production Run

[Duane Fischer, W8DBF]

KB2QGG asks: 	
	
I have a S-77a and the schematic I got for it says 'run #3'. The components do
not match the set in some places. There isnothing on the chassis to indicate
what production run it is. How do I know? Where can I get a corrrect schematic
for it with matching components?	
	
Felix 	
	
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