I have a blown glass, through hole diode. I believe it is a DO-35 package, but am not sure. I believe it says 18B2 on it. I believe it is a zener diode - probably between 12 and 22V (18V would make sense).
Anybody know what this is? I was hoping 18.2V was a standard zener voltage, but it doesn't seem to be.
It is out of some Japanese test equipment and they seem to mostly (only) use Japanese parts. So I would guess it's from a Japanese manufacturer, but am not positive.