Two thoughts about your buzz. One is that sometimes glue joints look good, but if you put watery CA glue along them, it soaks in where you never dreamed it would go and the buzz goes away. Another is a buzz I chased for 6 months on a Baldwin SD-10. I still carry the culprit as a trophy. It is a small black microphone knob--about the size of a marble. Fell off the mic and got wedged in the treble corner between the plate and the soundboard, black, round side out, so that it was impossible to see and a wide variety of probe tools simply slipped off it. I thought of it because whenever the conditions were damp there was no buzz. When the surroundings got drier, the knob wasn't so tightly wedged between the board and the plate and the buzz came back. Buzzes are such fun! Good luck. Diane Diane Hofstetter ----Original Message Follows---- From: "Tom & Sharla Zasadny" <zasadny at hotmail.com> Reply-To: Pianotech List <pianotech at ptg.org> To: pianotech at ptg.org Subject: buzzing on piano Date: Sat, 03 Feb 2007 23:13:29 -0600 Greetings, What would be the origin of a buzz on this 1930's Steinway Model "M" that seems to be soundboard related and acts like lthis: It has been present for a couple of years; less in the summer and more in the winter and at F5only. It is more wooden than metallilc in quality and is more pronounced with a harder key blow. E5 was pitched up to the F5 pitch and caused the same buzz. F#5 was tuned down to F5 and also caused the buzz. Pressure over the bridge, movement of the duplex, movement of the strings under the capo, pressure over all ribs and over the soundboard top and bottom, tapping the bridge pin down and increasing its angle availed nothing. The soundboard has no cracks and bearing is good with good sustain. Visual examination with light and mirror under the plate showed nothing. High air pressure through every opening was not productive as well. Muting two strings at the F5 quieted the buzz. When only one was muted, it returned though less than with three singing strings. If I struck two singing strings, the buzz equalled that of three strings with a less forceful blow. Now here is the only diagnostic clue I can give. When the plate bolts were tigtened the buzz disappeared though for only 15 minutes. (It came back as I was doing some regulation testing.) I tightened the bolts again and it was quieted for a short time. Tightening again (I put overly heavy torque on this last time) lessened the buzz at F5 but it turned up at C6. Soon the buzz became strong at C6 and remained small at F5. I checked for glue along the entire inner rim at the soundboard junction and I eliminated all action and environmental sympathetic vibration questions. What is this? How do I fix it? The customer is piano professor and accomplished performer. He is ready for this to be history. Thank you friends, Thomas N Zasadny (home)1(319)-934-3552 _________________________________________________________________ Get in the mood for Valentine's Day. View photos, recipes and more on your Live.com page. http://www.live.com/?addTemplate=ValentinesDay&ocid=T001MSN30A0701
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