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Additional Pictures 

 

The printed circuit board (PCB) of a SR-51-II manufactured in September 1977 with its (mirrored) backside.

The printed circuit board (PCB) of the power supply of the SR-51-II and its (mirrored) backside.


If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, December 20, 2023. No reprints without written permission.