Why does the E12 resistor sequence use 27 and 33 instead of 26 and 32?
The “coverage” explanation given by the top answer doesn’t make a whole lot of sense. With the manufacturing tolerances involved (especially historically when those values were chosen!) the idea that 22 and 47 gives more useful combinations than 22 and 46 is numerology, not engineering.Wikipedia only says that the deviation is for “unknown historical reasons”. Maybe a deep explanation doesn’t exist, and it’s a simple historical error that was propagated?