As long as we're discussing power supply issues, i've just had an experience 
I never expected.  My RM-35 from Astron failed and, oddly, the problem 
seemed to be in the switch.  You'd think it would be somewhere farther along 
in the circuit.  I was on cw and started to hear an odd sound every time the 
transmitter in the k3 keyed.  Like an arcing but different in that it wasn't 
a snappy sound.  At first, I thought it was the rig but then the transformer 
in the supply started to jump occasionally, as it does when you first turn 
the supply on.  When I started to smell smoke right after that, I hastily 
signed and reached up to turn off the supply but the switch wouldn't throw. 
it moved a bit but was actually fused in place.  Later, when I came back 
down to the shack it had cooled down and was very firmly fused in place.  I 
had another, older Astron on the shelf so I hooked it up and was back on the 
air the next night.  I haven't taken the cover off of the stricken supply 
yet but it oughta be interesting.  It's not a complicated device so I expect 
to be able to fix it.  Anyone else have a similar experience?  Lou  WA3MIX