KBK update for Sunday, 2nd February
The history of German Hall ICs is now both clearer, and less clear, after Wolfgang Zucker provided some catalogue entries for Siemens Hall ICs from 1977–1985. This in turn made it possible to locate the origin of the PDF previously used as a reference. It seems that some models were quite short-lived, being in production only during the early 1980s. This might be a clue as to why, as early as 1986, RAFI were using HFO Hall ICs. We now also have more details on SAS 201–221, albeit not the supply voltage ranges that could be tied up to RAFI’s RC 72 specifications.
Sadly, still no word from anyone at RAFI at all.