In article , Drew Dalgleish
wrote:

How long does a set of headsets last? I leave them plugged in and
always in the plane in an unheated hangar. Lately I've had to turn up
the volume knob a lot farther to get the same amount of volume from
the radio.
Drew

I have had my DC 10-40's for 23 years. I had the cords and plugs
changed at 18 years. When you send them back to DC for overhaul, they
perform a complete inspection and test of all components and replace
anything out of spec.