AudioBanter.com - View Single Post - Fred Forssell JMP-1 micpreamp

In article writes:

One thing I've discovered that's kind of interesting is that I can tell
when a device has a bad transformer just by putting a finger on the
chassis. It feels to me as though it's vibrating or trembling.

Mechanical vibration of transformer windings can indeed be a source of
acoustic noise. I suppose that it's possible to feel the vibration
before you can hear it. But usually it's the power transformer that's
got the loose windings or core laminations. Have you been able to
isolate the "feel" of a signal transformer and feel it vibrate along
with the audio?

--
I'm really Mike Rivers - )