---------------------- multipart/alternative attachment Hi Ron, I would not be surprised if there was a poor pin block to flange fit. Particularly if it's a newer instrument. Regards Roger At 09:52 PM 8/14/02 -0500, you wrote: >I don't have any information specific to the Petrof, but in general... > >>Stability seems to be a problem. This piano has an open faced pin block >>which means that the pins stand upright and do not lean back as in a >>conventional design. The coils stand 1/4" - 3/8" above the block. The >>hypothesis is that the pins may be bending excessively due to the high >>coils, making setting the pins more difficult. >>A possible cure would be to simply set the pins deeper into the >>block, although this is speculative theory, (particularly since this is >>how it was designed). Additionally this would add friction to the pins >>which may contribute or create a new problem. > > >I wasn't aware that open face meant the pins stand upright instead of >leaning back, but there are a lot of things I don't know and that isn't >the problem in any case. Is the problem really with tuning stability, or >getting a solid tuning in the first place? These are entirely different >things, and driving pins won't improve tuning stability. It will, however, >give you a little better control for getting the string settled in. An >open face block with the coil 3/8" above the block shouldn't tune any >differently than a piano with a non-bushed plate with the coil 1/8" above >the 1/4" thick webbing, so if you don't characteristically have trouble >with that very common type, the Petrof shouldn't be a problem either - >unless that's not the problem. How tight are the pins already? What's >unstable about the tuning? Unisons, overall pitch drift in certain >specific areas? Do the strings render well across the bearing points while >you're tuning? Hot lights? > > >Ron N ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/5a/21/96/f4/attachment.htm ---------------------- multipart/alternative attachment--
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