This depends, I think, on the construction of the pinblock. Some years back, in another time and place, I inherited a number of clients from a tuner who had recently died. It had been his practice to install heating rods in the action cavities of as many pianos as possible. These were always mounted on special posts that were installed into the center rail of the keyframe. The rods were located about 20 to 25 mm above the keys. As this was in the days before the humidity sensor controls were available the things were running constantly. The pinblocks that were damaged-i.e., delaminating-were generally those with thicker sections of wood such as the three-ply and five-ply Steinway blocks and the older pinblocks that were put together with animal hide glue. More recently built pianos using multi-ply (i.e., thin plies) pinblocks assembled with (probably) phenol-formaldehyde adhesives seemed to have no problem. Of course, I saw these pianos some 30 years ago. I took them out of the pianos that were having problems-generally when I replaced the pinblocks-and I don't know how the rest are holding up holding up today. ddf Delwin D Fandrich Piano Design & Fabrication 620 South Tower Avenue Centralia, Washington 98531 USA del at fandrichpiano.com ddfandrich at gmail.com Phone 360.736.7563 From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Tony Caught Sent: Tuesday, November 23, 2010 3:16 PM To: pianotech at ptg.org Subject: Re: [pianotech] Dehumidifier rods Actually what I am saying WRONG to is the placement of the heating rods. If you put a heat source in an enclosed area like in the action cavity then you are drying out not only the action but also the tuning plank. In my opinion this is detrimental to any piano. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20101123/f2813cf6/attachment.htm>
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