Thanks, Allan. I understand about humidity control, but I was under the impression that the scale design deficiencies of those notes in low tenor do affect how far and quickly they go out of tune--they're touchy, right? Or am I totally mistaken? I wasn't talking about the stability of the whole piano--sorry I didn't make myself clear. The DC system is for the whole piano . Barbara Richmond, RPT near Peoria, Illinois ----- Original Message ----- From: "Allan Gilreath, RPT" <allangilreath at bellsouth.net> To: pianotech at ptg.org Sent: Monday, September 27, 2010 5:15:50 PM Subject: Re: [pianotech] Helping out a GH-1 Good evening Barbara, In the past, changing the last 4 notes to wound bichords helped immensely. I also rescaled the entire instrument so that helped out across the scale even more. We changed out the tri-chord agraffes to bichord agraffes (Pianotek metric thread agraffes), added two hitch pins (there's a nice little procedure for that) and filled the "extra" tuning pin holes with epoxy leveled with the top of the plate and painted to match the plate. Of course the damper split wedges were traded out for bichord wedges. This will affect tone but the tuning stability issues are a different story. I've been taking lots of measurements with dataloggers to see what happens with temperature and humidity over time so I've had my eyes opened even more than I ever realized I would. However, that's all part of another class that I love to teach... Allan Allan Gilreath, RPT Registered Piano Technician President - Allan Gilreath & Associates, Inc. website - www.allangilreath.com email - allan at allangilreath.com phone - 706 602-7667 On 9/27/2010 5:51 PM, Barbara Richmond wrote: Thanks, Ryan, this is very helpful. I've been on the phone to a string maker, too. Duh, it hadn't occurred to me that I would need to measure the whole string scale, because I haven't done this before. I'm glad to know this <before> I write the estimate. :-) Hmm, I wonder how heavy that brass weight was... Less bad is what we're after. Actually, I think it's the tuning instability that bugs my customer most. A DC system is being considered, too. Thanks again. Barbara Richmond ----- Original Message ----- From: "Ryan Sowers" <tunerryan at gmail.com> To: pianotech at ptg.org Sent: Monday, September 27, 2010 4:30:42 PM Subject: Re: [pianotech] Helping out a GH-1 I had a client with this same issue this past year. I suggested she hire Del Fandrich to take a look at it. Del found that the tension on the last 4 notes really dropped. I think it got as low as around 80 pounds of tension. If I'm remembering correctly we put in 4 bichords. (8 strings total). We used the same agraffs, utilizing the two outside holes. We were able to keep the trichord wedges for the Damper felt. Del did ad at least one hitch pin. Lastly he installed a pretty hefty brass weight to the underside of the bridge. All in all it worked out pretty well. As Del said all along the goal was to make it "less bad" and it was certainly successful in that regard. The client went from being constantly distracted by the lowest tenor notes to being able to enjoy playing again. So don't give the client too high of an expectation! -- Ryan Sowers, RPT Puget Sound Chapter Olympia, WA www.pianova.net -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100927/1f907d9f/attachment-0001.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: 2007-RPT-Logo-Web.jpg Type: image/jpeg Size: 13287 bytes Desc: not available URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100927/1f907d9f/attachment-0001.jpg>
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