This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Hello Alan, Yep great description, remind me of some nightmares ! And let me think that it should be interesting to install anew action if the basis is in acceptable state. Purist here don't like the idea, to install anything new in an old piano (!) but am persuaded one can obtain an acceptable tone not too strange, with modern parts. Cost may be paid by somebody of course ! Best - have a good week end . Isaac -----Message d'origine----- De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la part de Alan Forsyth Envoyé : samedi 21 août 2004 05:00 À : Pianotech Objet : Herrburger Brooks spring & loop action Jon or Noj asked; "Anyone out there familiar with this action? I have no info on regulating procedures or specs. I tried some addresses in England to no avail........" There are 2 types of spring and loop action. The older version is generally referred to as the "Costa" spring and loop. This version can be found in pianos made in the 1880's to 1895. It is basically a modified version of the original sticker action, but in this case the sticker is the jack, check,damper lifter and whippen all in one. In essence, it has 2 moving parts instead of 3 as found in the tape check action not taking into account the damper assemblies. The whole (jackass- embly) is connected to the hammer butt via a spring from the jack to a loop in the hammer butt. They are an absolute pain to regulate if the spring tension, length and thickness is incorrect. The single spring has to do the equivalent work of the jack spring, butt spring and tape. If this is the type you are referring to, just scrap it; it is just not worth bothering about unless all the springs are present and in good condition. Otherwise the specifications are as per normal i.e. set-off, hammerblow, check distance. You will find though that the hammer flange assembly is mounted flat instead of vertically, so if you need to travel the hammers, you use packing under the flanges instead of casting the shanks. The second version is a normal tape/check action that appeared to have been discontinued around 1910. You will probably only find them in overdamper actions that were common here. I have had to deal with quite a few old German pianos that have this type, the name of Rud Ibach comes to mind. Here a long spring is used as both the jack spring and the butt spring. You regulate them as a normal upright action, but again if you have to replace the springs, they have to exactly match the originals. I do not know what the specific tensions are supposed to be and I doubt whether anyone alive knows. Generally, the cost of overhaul way surpasses the value of the instrument so the need to know specifications is not an issue. I usually advise the customer that such a piano should only be restored for semi-mental reasons, as I put it. Regulation is just as normal. Assembling the parts can be tedious as it is quite tricky to thread the spring through the loop. It's one of those jobs that requires 3 hands,...................................................... and a few more balls. AF ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/60/ed/18/91/attachment.htm ---------------------- multipart/alternative attachment--
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