Pianotech

  • 1.  Petrof modl IV pinblock installation

    Registered Piano Technician
    Posted 06-15-2018 18:36
    Anyone rebuild a Petrof model IV? I have a new customer with one from 1998 on which the back side strings are in contact with the edge of the plate in front of the hitch pins. I have seen this on another Petrof a little bit older. There are no duplex alloquots. I can't lower the plate without removing it.
    It doesn't have enough angle at the back to add a bearing or alloquots. The pinblock appears to be screwed into the rim on the outside of the plate struts, so it should come out with the plate and strings attached. But it also looks like there is some glue squeeze out where it sits on the rim, so I dunno. Anybody know if the pinblocks are glued in, or will come out with the plate and strings attached?


  • 2.  RE: Petrof modl IV pinblock installation

    Posted 06-16-2018 08:10
    Is there a problem with the way the piano sounds?

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    Terry Farrell
    Farrell Piano Service, Inc.
    Brandon, Florida
    terry@farrellpiano.com
    813-684-3505
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  • 3.  RE: Petrof modl IV pinblock installation

    Registered Piano Technician
    Posted 06-17-2018 23:55
    Yes, Terry. This is what prompted me to start investigating.

    Everything from the treble side of the last strut is weak and tinny. 
    The profile of the front edge of the plate changes somewhat there.
    I don't know exactly which note (I have a new P173 in the store
    and will check) but I think it's somewhere in the mid 5th octave. 


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    Dave Conte
    Owner
    North Richland Hills TX
    817-581-7321
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  • 4.  RE: Petrof modl IV pinblock installation

    Registered Piano Technician
    Posted 06-18-2018 12:05
    I was glad to receive a few requests for books. Then I realized that not everyone from our chapter was at our meeting, and I need to check with a couple of them before giving it all away.

    I know who was first in line and will get back to individuals about this in a few days.

    To answer one question "not a crate, but a box." Unless you count all the service manuals, then 2 boxes.

    Thanks.

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    Cindy Strehlow
    Urbana, IL
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  • 5.  RE: Petrof modl IV pinblock installation

    Posted 06-18-2018 08:25
    I was a Petrof dealer during that era. In the grands you are exactly correct, the plate can be pulled with the pinblock and strings attached. There is no glue involved. The most time-consuming part of the whole process is loosening the pins and getting the string out from between the bridge pins.

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    Charles Rempel
    Dampp-Chaser Corporation
    Hendersonville NC
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  • 6.  RE: Petrof modl IV pinblock installation

    Registered Piano Technician
    Posted 06-19-2018 02:30
    Thanks, Charles. 

    I just got a message from another tech that did warranty work for Geneva
    and said that there were a number of these that came in for loose tuning
    pin warranty work and if the wrest planks were replaced, may have been
    glued in, which may explain why I see glue in this one. Maybe that's 
    where the plate elevation problem came in too. 

    I'm thinking I can probably get the joint to break loose and lift the strung
    back out with the pinblock intact. 

    Thanks for everyone's feedback.

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    Dave Conte
    Owner
    North Richland Hills TX
    817-581-7321
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