Bill Ballard wrote: > I'd been listening to a grunting sound, like a fallboard-to-front-stretcher > or loose metal lyre brace, during the tuning of a Falcone 74, sympathetic > to F4. In trying to chase it down, the best I could come up with was that > it was coming from inside the action cavity (loud and clear). <snip> > What I needed was a signal generator, tunable to any pitch in the hearing > range which could drive a speaker magnet to inject 348 Hz onto various > spots inside the action cavity. It would sure excite the sympathetic > vibration. You might want to check surplus equipment stores around your area. Besides often having some really cool odd-ball stuff, you may find an old analog signal generator. Rob Goodale, RPT
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