Amplifier and tone generator. I haven't seen a good tone generator in a while, but some reasonably priced ones should be out there somewhere. Any amplifier with a few watts output should move it fine I'd think. dp David M. Porritt, RPT dporritt at smu.edu -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of John Delacour Sent: Wednesday, July 14, 2010 5:25 PM To: pianotech at ptg.org Subject: Re: [pianotech] Tuning fork puzzle At 16:06 -0500 14/7/10, Porritt, David wrote: >How about the voice coil of an old speaker. Maybe, but how would I feed it?
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