On Wed, 10 Oct 2012 21:12:48 -0400, Steve Walker
wrote:

Got a Sharper Image background sound generator for sleeping. Problem is
the 60 Hz hum. Sounds good off the batteries, but the wall wart sucks.
It's sealed, potted probably. Need a good, filtered,small and not ugly
replacement. Less than 10 bucks and it's bought. Otherwise, I'll have to
tear the sound generator apart, but I'm afraid once the 60 Hz is inside
the case, I'll not be able to eliminate it. Any suggestions as to a good
wall wart? oops, 6 volt DC, 300 mA.
You need a switch-mode supply - no 60 hz on the output because they
run high frequency.

Quiote possible a 5 volt unit would do the job - one designed to power
USB devices (5 volt 2 amp)