Pitch raise

Rick

I had a problem with a pitch raise on a Yamaha U3. It was about 60¢ flat and after the first pass after ending the pitch raise mode the piano was very sharp in the top two sections, nearly 10¢. Normally when I do a pitch raise the tuning is very close and minimal work is required for the fine tuning. Perhaps the algorithm for that much of a pitch raise needs correction.

Frank Illenberger

Very interesting. Do you know if there is something special about the plate of the U3? If you still have the tuning document, I could have a look at the initial pitch mesurements.

Rick

Have sent file to you.

MilanDka

I'll join you. I noticed this one too. If the piano is too flat, the Pitch race is then too sharp in the high part. E.g. the piano is -40 cents and after tuning the discant is +10, sometimes 15-20 cents sharp.

Rick

I pitch raised a Yamaha C3 X today about 40¢ and it worked well, not too sharp at the top.

Frank Illenberger

Rick Thanks for the feedback. This is good to know.

Rick

Another pitch raise question:
I did a pitch raise on a new Kawai GX-7. After doing the inharmonicity measuring I realised it needed a small pitch raise. When viewing the pitch raise curve there were 2 notes that were about 30¢ flat. I of course remeasured them and they were just a little flat like the others. Why was this?
Many thanks

Frank Illenberger

Rick This sounds strange indeed. Was there any loud background noise while you performed the measurement?

Rick

Perhaps, I was in a piano showroom with some extraneous sounds. Would that have affected the inharmonicity measurements?

Frank Illenberger

Rick In principle yes, but always take a quick look at the curves and the IH outlier warnings and if the values look plausible then you are safe. The same goes for the pitch measurements. If the whole piano is 20 cents flat and only a couple of notes are more off, then you should get suspicious and re-measure them.

MarkF

Hello Everybody.
I recently worked with a Bosendorfer model 225-711 grand piano with extended bass to F0. I had to perform Pitch Raise.
I had some issues when I tried to install Settings for Pitch Raise. The program did not find B3 for the First Treble Strut.
Pianoscope did not recognise B3 because it does not exist in the settings, the first note that the program knows is D4. Frank, could you please add notes below D4 in order to have B3 there for First Treble Strut?

Frank Illenberger

MarkF Hello Mark, the Bösendorfer 225 Imperial has four plate struts, but pianoscope only needs to know the position of the two struts in the treble. You don't need to enter the location of the struts in the bass or tenor.

MarkF

Hello Frank, thank you for the information!