[Elecraft] Anyone know this info about switching supplies?

[Tom Hammond]

Folks:

A local discussion has 'erupted' regarding switching poser supplies and whether
they can fail in an UNregulated (e.g. high) output voltage condition, or if
when they fail will they (almost) always fail in a NO OUTPUT mode?

I think this discussion may have been started as a result of a subject here on
the reflector about overvoltage protection (OVP), but it's managed to take on
a life of its own with respect to the MODES in which a switching P/S 
can/will fail.

Anyone have enough real experience to express their thoughts on this subject.

Must admit... I have no clue myself.  I've 'heard' that most switchers fail in
the NO OUTPUT mode, but this is strictly hearsay.

Let's try to get several responses and the let the subject drop before IT takes
on a life of its own on the reflector and Eric has to step in... he's 
busy enough
right now. <G>

73,

Tom   N0SS