DIYAPASON-L Digest #623 - Monday, August 12, 2002
 
Pouch leather and DVA magnets
  by "Jon Fick" <jon@VermontFicks.org>
Wurlitzer opusing
  by "Drew Taylor" <drewt@loritsu.com>
Re: [Residence Organs]  Wurlitzer opusing
  by <Tspiggle@aol.com>
 

(back) Subject: Pouch leather and DVA magnets From: "Jon Fick" <jon@VermontFicks.org> Date: Mon, 12 Aug 2002 09:07:14 -0400     Speaking of pouch releathering, I'd be interested to know how releathering is done for Reisner DVA (direct valve action) magnets. I would imagine = some sort of jig is set up to 1) hold the magnet securely, and 2) hold the new pouch leather and valve leather on center and against the spring while the glue dries.   A second (and more generic question to pouch leathering) is: how much "slack" do you allow in the pouch leather when you install it? Obviously you don't make it absolutely tight, and you do allow some overtravel such that there will be residual spring tension against the bottom of the toe board.   =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D   The reason for my questions is this. I have a Spitz Principle 4' & 2' = chest in the church organ that has older Reisner DVA magnets. Upon de-winding = (if that's a word) certain pipes groan and wheeze. Thinking that the old armatures might be too heavy with gravity holding them open, I replaced = all the armatures but it made little difference. It turns out that the pouch springs are quite weak. I measured the residual "up presssure" of each spring with no wind on the chest. The magnets with the weakest springs exhibited a resisting force of 0-2 grams before the valve would begin to open. These were the very pipes that would groan as wind was dying. = Silent pipes exhibited something like 4-10 grams of "up pressure." As a comparison, I measured the residual pressures of the DVA's in a chest made by OSI in the 70's. Those DVA's exhibited 10-20 grams or = so...significantly more! And OSI measurements show 25-30 grams. So, I need to replace 72 springs and pouch leathers.   Jon Fick Christ Memorial Church Williston, Vermont    
(back) Subject: Wurlitzer opusing From: "Drew Taylor" <drewt@loritsu.com> Date: Mon, 12 Aug 2002 11:07:42 -0400   Good morning list, Does anyone know if Wurlitzer stamped an opus number on their keyboards? I have a 2 manual unit from the 1930s, or so I was told. It's not a = typical looking keyboard unit, to start with it doesen't go back very far and has = no room for pistons. I have looked all over for an opus number but there are = so many little nooks that I may have missed it.   Thanks and take care.   -Drew        
(back) Subject: Re: [Residence Organs] Wurlitzer opusing From: <Tspiggle@aol.com> Date: Mon, 12 Aug 2002 20:59:22 EDT   Drew:   I used to have a Wurlitzer style B. It could not find an opus number and = was advised by Dave Junchen, I believe, that Wurlitzer rarely ever put opus numbers on their organs. However, I did find "Rivoli Theatre, Greenville" = on the pedal board or bench of mine and from that I was able to trace the = opus no.   Tom