<html> <body> The house was cooled with an evaporative cooler (common here in NM) and it was running--a rumble in the background.  Interesting thought though.  I'll have to look into it.  I've since wondered if seating the strings on the bridge and leveling/straightening the strings under the pressure bar would affect it.  Probably not as it did seem fairly consistent through a couple octaves.  I usually do this with grands but I haven't made it a practice with small uprights yet. ;-) Had a cooler running while I worked on the grand but not the same effect. Andrew At 01:58 PM 7/4/2004 +0000, you wrote: <blockquote type=cite class=cite cite>This reply is about the Gulbranson.Was there a ceiling fan running in the room where the piano was?That can make the sound you described.    Robin Olson <dl> <dd>-------------- Original message -------------- <dd>> I recently brought a Gulbranson Console back up to pitch and tune. I <dd>> encountered a curious phenomenon that I'd like to delve into. When I <dd>> brought the unisons into tune I would eliminate interference beats but <dd>> would open up another quaver (the best I can describe it) that was <dd>> consistent throughout the mid treble. I tried re-tuning several times and <dd>> it opens up only when the unisons are well in tune and the intervals sound <dd>> OK except for the quaver in the notes. The speed, fast, was fairly <dd>> consistent from one note to the next. <dd>> The customer stated that this was the best her piano had ever sounded, was <dd>> ecstatic, so I didn't bring that up. I'd just like to be armed with some <dd>> ideas for next time I encounter it as I hate it. <dd>> <dd>> The ne! xt piano that day was a Knabe 6' grand and quite a joy to bring <dd>> 25cents plus up to pitch. It had four/five pins at the bottom of the bass <dd>> driven so the coils were all the way to the plate. I CA glue treated them <dd>> and some notchy pins at the high treble. I'm wondering if it is possible <dd>> to ream the holes a little and shim with sand paper without breaking the <dd>> coils. I'm thinking of loosening the tension on those strings and then <dd>> driving the pin out from the bottom. Problem is, is it possible to drive <dd>> it back in with shims? Or can those heavy bass strings be unwound from the <dd>> pin and reinsterted without breakage? <dd>> <dd>> Be-quavered in New Mexico <dd>> Andrew <dd>> <dd>> _______________________________________________ <dd>> pianotech list info: <a href="https://www.moypiano.com/resources/#archives" eudora="autourl">https://www.moypiano.com/resources/#archives</a> </dl></blockquote></body> </html>