Quote:
Originally Posted by flatmap 
A microphonic tube, might well pick up the vibration from the case tap or perhaps
even just plugging and unplugging the headphones.
When the tube is operating normally, I assume that it sounds fine. True?
If you're getting elevated background noise during 'normal' operation, then I'd
definitely replace.
No background noise except when I am using IEM's, which must be quite normal.
Thank you very much for the help
