[Tyso_Bl]

Trying to work out what to replace this with, its a multi disc selenium jobbie, lookis like the encapsulation dissolved or otherwise failed from the spring tension.
Its a type FSY7093A , 120V rating. I can't find out anymore about its properties, such as its forward voltage drop, reverse leakage, forward resistance, etc.

Any thoughts? I'm going to do the obvious and try a silicon part, see what happens...