Yamaha U3H rear left vibrations

Look how, as usual, not much can be said without supporting photos, but after such a short time, two such disastrous hypotheses seem excessive.. finding resonances is always a pain, but start from the outside: the walls, paintings and objects you might have near the walls; check the music stand hinges and try opening and closing the upper part of the piano. While you're at it, take a look at the hammer felt and see if by any chance they are already grooved (the buzzing notes could be due to strings being poorly spaced or it could be the hammer hitting two out of three strings).

Also check the pedals, whether you use them or not; sometimes the connection between the pedal and the relative mechanism is metallic and is tightened by a 'wing' screw or a nut that, if it loosens, creates very annoying noises that seem to come from nowhere! (to do this, you will have to open the panel under the keyboard; look in the center or on the sides, there should be a mechanism to unlock the panel).

Hi, nice to meet you, thanks a lot in the meantime.

I have already checked a few things. Pedals, lids, pedal rods and various hinges... they all seem okay.

I will call back the technician who was at my place 5 days ago. In addition to retuning the piano which had gone out of tune (probably due to the moves I had the piano made and as he told me because of the very dry climate of recent days), he told me that the piano is probably settling due to changes in humidity and temperature.

A me comunque non quadra perché in questi 2 mesi non ha mai avuto questo tipo di vibrazioni. Credo tutto sia comparso da quando ho sentito lo scricchiolio ....sembra proprio una vibrazione della struttura perché si trasmette un po' anche ai tasti.....e poi mi pare che ha cambiato sonorita'....meno potente di prima e un leggermente più nasale

Strings, hammer strike point etc. Everything should be okay. It really seems to come from the soundboard or at least from behind the piano.

I don't know. Tomorrow I will call him back and if it persists I will contact the shop and ask for an intervention.

I believe that since it is under warranty I shouldn't have major problems... let's hope.

Thanks a lot. I will let you know something if I get to the bottom of it.

I believe that the piano does not rest with the same weight on all 4 wheels. This generates an imbalance and it is easy that vibrations are caused by an area that discharges less weight to the ground. Rather than adding a shim, I would try to create a stable and precise supporting surface, perhaps with a nice wooden board that also serves as a base. Try testing it by moving the piano to another area of the room where you are sure there is a floor on which the 4 wheels rest uniformly. If you no longer notice this vibration, it probably depends exactly on what I told you; otherwise, you will have to investigate further.

Uprights are more or less the same; after 20-30 years, almost all of them rest on three wheels, except for the more prestigious German ones which were and are made with a certain type of selected materials (I am speaking especially about the rear posts, the grain cut of the woods).... This happens because the piano undergoes torsion from the frame over time and deforms; this phenomenon was quite evident on pianos where the bass brace was missing at the point where all the tensions concentrate, as for example in the Anelli model XIII (they would become truly crooked).... So what can one say, if the vibration depends on this, by putting the piano on isolators and compensating with hard felt for the gap created by the higher wheel, the problem should be resolved; otherwise, the vibration must be sought elsewhere (the hinges, something hanging on the walls or other things in the room).

The tuner can certainly understand what type of vibration it is and is able to identify it immediately, something that cannot be done from a distance or with photographs.

The disadvantage of lifting the upright with a riser or with isolators is: the pedals will end up being too high and uncomfortable for the pianist (in an upright they are already so by nature).

Bye

I have nothing more to add to the excellent advice expressed

Thank you very much to everyone for the advice.

Max

Here I am,

i haven't resolved it yet.

after various adventures, I also had the opportunity to change the piano, but those they proposed did not excite me.

the seller sent me another technician who seems really okay.

the problem is that the sound seems disturbed by humming and it is no longer like it was in November when it arrived at my house.

the technician (who, among other things, apparently worked for Yamaha for 25 years) looked at it quickly, tested it, and told me that the soundboard, the structure, and the glue joints, in his opinion, are fine.

he told me that it is out of tune (...well... they tuned it for me about a month ago????!!-...) that it needs voicing on a few notes, the action needs to be regulated, and probably the buzzing I hear could also be some strings.

... the sound is metallic and a bit annoying. It wasn't like when I brought it home...

he has scheduled an intervention of about half a day in a week to fix the various things.

hopefully... the sound vibrations are felt a bit less with the lid open, and to me they seem to come from the back.

i am attaching 2 files where you can hear the sound quite well... what do you think??

thanks a lot Max

It needs tuning. The resonances that bother you are 90 percent due to the choruses needing tuning and 10 percent from a slight intonation issue.

But first it needs tuning, then we'll see about voicing... "tune-regulate-voice" is the rule.

Sorry Max, but maybe you attached the wrong files, to me this looks like a guitar.

(maybe with this statement I'll make a fool of ....)

In effect, from what can be heard from the file, it sounds very out of tune and not intonated. Have it fixed and then listen to it again.

Thank you all.

I await the technician's intervention then.

Regards

Max

good morning everyone

i wanted to ask your opinion... what do you think...

on my yamaha u3h this happens to me ...(it's nothing serious... more of a curiosity than anything else)

when I play a beautiful two-handed chord in the middle octave pianissimo without the sostenuto pedal, everything is perfect; when I play it pressing the sostenuto pedal first, I hear a sort of metallic click (..I don't know if it could be the springs, the sostenuto pedal bar which has lately started to creak very slightly, or something else).

i would be very grateful if you could give me your opinion.

thanks a lot

maxpiano

Ah sorry... one further specification to help you understand...

This click only happens the first time I depress the chord... if I strike it again while holding the pedal down, it doesn't do it anymore.

Regards