At 18:08 3/1/2006, you wrote: >My reference to the telephone was partly a joke >-- althought it is an emergency source -- but, >please, for the love of all that's holy, don't >tune the piano to your vacuum cleaner ... > >Unless you want a tuning that really sucks .... snicker, giggle, snort. > >Alan Barnard >Salem, Missouri The main problem with using vacuums for pitch sources is that the bags get full. (if they have them, and they are being used properly) As the dust fills the bag/clogs the filter, the fan pulling the air through cannot move as much air. Since the fan is not drawing as much air, it is not doing as much work and the motor (with less load) will run faster. Motor runs faster, pitch goes up. I've observed a 25¢ pitch rise in one hour on one vacuum. This does not even take into consideration any voltage transient which may have taken place. (I didn't have my multimeter out that day...) ;-} Conrad Hoffsommer You have the right to remain silent. Anything you say will be misquoted, then used against you.
This PTG archive page provided courtesy of Moy Piano Service, LLC