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Denon DEC-621 Desktop Calculator

Image Courtesy Rick Furr

The DEC-621 is one of Denon's first-generation hybrid IC/Transistor Desktop Electronic Calculators. The calculator has a 14-digit Nixie display, four functions, and operates with a fixed decimal location of 0, 2, 3 or 6 digits behind the decimal. The DEC-621 is a Denon DEC-61A4 calculator with the math function key area slightly re-worked to remove the square root key. There is no difference electronically between the DEC-621 and the DEC-61A4. The DEC-621 was a bit less expensive than the 61A4 due to its lack of the square root function key.