I've had some
success fixing H-250/U and H-350/U handsets with bad earphone elements
using this mini-speaker from Mouser Electronics:
It is a little smaller than the original but with a bit of scrap foam padding it fits nicely.
It
is a 100-ohm element so a better choice than a low impedance element.
It has had lots of level and good quality on the radios I've tested so
far.
Steve WD8DAS
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Radio is your best entertainment value.
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