I neglected to mention that these hearing aid components must fit in the ear and they run on 1.4 volts.
I have one of those Radio Shack amplifers and they realy do a good job of amplifing, but you have to ware it and those earphones.
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Does anyone know how or where to get parts for a digital hearing instrument? There are only 4 parts in there: speaker, mike, cmos, and volume control, but I can't get a line on where to get any of them.