Soemtron ETR220 Calculator Gallery

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Many thousands of Soemtron ETR220's were made during their production run and by modern standards they are very large and cumbersome, but very typical of their age - the 1960s. This section shows a few views of a typical Soemtron ETR220 in good condition owned by calculator collector Serge Devidts.

Good condition ETR220	Inside view	Decimal point selection	Nixie tube display close up
Four photos above ©2007 Serge Devidts, for more see his website.
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Photos here show a glimpse of the reversed order build of the early Soemtron ETR220's along with the differing power supply configuration.

Reversed board order	Regulator heat sink	S#27027	LEFT/RIGHT build units
Three photos above ©2009 Philipp Maier			Picture ©2012 Rüdiger Kurth
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