[R-390] Selenium Rectifier Redeux

[Barry]

Another question about the selenium rectifiers.  Is it possible that the
failure rate of the this component is due to the relatively low voltage
applied to it?  I don't know what these are rated, but I'm thinking they are
probably good for 100VAC or more.  With only  28VAC applied, perhaps this
doesn't stress these very much.

Also, with the low voltage in this case, if the rectifier should fail, is it
likely to go out in a blaze of glory?

Just wondering...

Barry - N4BUQ