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Additional Pictures 

 

The printed circuit boards (PCBs) of a SR-50A (Version 2) manufactured in February 1976 (left), SR-51A (Version 2)
manufactured in April 1976 (middle) and SR-56 manufactured in January 1976 in a side by side comparison.

The printed circuit boards (PCBs) of a SR-50A (Version 2) manufactured in August 1976 (left), SR-51A (Version 2)
manufactured in November 1976 (middle) and SR-56 manufactured in December 1976 in a side by side comparison.


horizontal rule

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

Joerg Woerner, January 6, 2024. No reprints without written permission.