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 
This is not the first time this question has arisen.
A quick check on Google with pronunciation dictionaries, wickipedia and
such inevitably comes up bal un -- I've never heard the pronunciation
using the y. I've used baluns, but never bayluns! :-)
Irv VE6BP