<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1498" name=GENERATOR></HEAD> <BODY> <DIV> <DIV> <P><SPAN class=900135113-24042005>Hi Richard,</SPAN></P> <P><SPAN class=900135113-24042005>The adjustable humidistat idea = has a few flaws, in my opinion.</SPAN></P> <P><SPAN class=900135113-24042005>It implies that relative humidity is = the key issue for the piano, and reinforces this focus on RH, instead of = EMC.  Technicians often ignore the end result [stability from Equilibrium = Moisture Content] in favour of the current situation [relative humidity at = this moment, what is the system doing right now?]. The "adjustable" idea = plays to this misconception a bit.</SPAN></P> <P><SPAN class=900135113-24042005>I have big question marks with: the = amount of adjustment feasible, actual means of accurately triggering an = adjustment to the cycling point within the device, and its ability to then = achieve those cycling results within the whole system. </SPAN></P> <P><SPAN class=900135113-24042005>Then, you gotta wonder whether we = really want another variable in our "detective work". Sometimes stabilising an instrument is worked on over a long period of time. When we are = baffled by our findings, we become suspicious of what happened while we = were gone. Particularly in a grand, I see many points of trouble but not much = gain to a tweakable control. As it is, it takes fully three spread-out visits to = realise <SPAN class=050342214-24042005>a = single</SPAN> provable change on a piano -- one to change something, one <SPAN class=050342214-24042005>for</SPAN> <SPAN = class=050342214-24042005>detailed </SPAN>tun<SPAN class=050342214-24042005>ing work </SPAN><SPAN class=050342214-24042005>at</SPAN> A440, and another to = measure <SPAN class=050342214-24042005>and</SPAN> see what happened.</SPAN></P> <P><FONT size=2></FONT> </P> <P><FONT size=2>David Patterson, RPT<BR>Patterson and = Company<BR>Exclusively Dampp-Chaser Piano Life Saver Specialists for 15 Years = </FONT></P></DIV></DIV> <BLOCKQUOTE dir=ltr style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px = solid; MARGIN-RIGHT: 0px"> <DIV class=OutlookMessageHeader dir=ltr align=left><FONT = face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> = richard.ucci@att.net [mailto:richard.ucci@att.net]<BR><B>Sent:</B> Saturday, April 23, 2005 = 7:44 PM<BR><B>To:</B> pianotech@ptg.org<BR><B>Subject:</B> humidistat<BR><BR></FONT></DIV> <DIV>List,</DIV> <DIV> </DIV> <DIV>Is Dampp-chaser planning on bringing out an adjustable humidistat = like the one Moisture King has? Also , can theirs be used with a dc = system?</DIV> <DIV>RU/UP</DIV></BLOCKQUOTE></BODY></HTML>