Today I encountered a Baldwin BP1 with "zinging" strings in the 5th octave. If the piano atlas app is accurate, the serial number indicates that it is a Chinese Baldwin built in 2015. Tapping them one way and then the other seemed to reduce but not eliminate the noise. Not having the time today to lower the tension on the strings of four unisons and then file the V bar, I shelved it for a later date.
After discussion with another technician, the questions arose:
-What about a loose washer on one of the plate screws?
-Does the action bracket have a spacer like those on the Wurlitzers?
I can go back and check the piano for those possibilities but the really natty question is:
-Is it possible that the pressure bar screws are loose due to improper drilling?
That showed up on another brand of upright from a particular period but I don't know about the Chinese Baldwins. How would one test to see if that were the source of the buzz? Has anybody had a similar experience? Is there a "go to" tech for Baldwin who would be able to shed some light on the subject?
Thanks for your help.
Jack
Jack Lofton, RPT
Seattle, WA
206-706-9383