[Elecraft] PowerWerx P/S Noise Problem Clarification

[W0UCE]

Perhaps I did not explain the noise problem, cause and cure situation
correctly.  One of the P/S was purchased from a friend, the other I bought
new.  The one purchased from my friend had been used; the input power select
switch on the back had be changed to 110V as it should be for 110v
operation. 

I had both P/S sitting side-by-side and had not yet changed the power in
220/110 switch setting to 110 on the new supply.  I mistakenly picked up the
new one and used it with the K-3.  Operating the P/S on 110 with the input
power select on 220 caused the K-3 to sound like a Marconi Spark Gap
Transmitter.  

The fix was simple, change the input power switch to 110. "My bad"  

73
Jack