In message , rickman
writes
On 7/27/2015 4:45 PM, Wayne wrote:
Just today I got a question from a new ham on the pronunciation of balun.
He has been around the scientific community a lot (physicists, etc.) but
not many RF types such as engineers or hams.
He claims that he rarely has ever hear the pronunciation "bal uhn", and
I've rarely heard "bayl uhn".
Anybody want to weigh in on this, heh heh 
Where does the "y" come in? The word is a contraction of balanced and
unbalanced. So I figure it should be pronounced "bal uhn" just like
the beginning of the two words it stands for.
Maybe the 'y' is added further south than Virginia. 
"Bayl-uhn" suggests that the user doesn't know (or care about) the
obvious origin and meaning of the word. The same goes for the occasional
use of "bal-uhm" and "bayl-uhm.
--
Ian