Terry, I think the PTA in question is the (British) Piano Tuners Association. They hold conventions similar to the PTG, if somewhat smaller. The secondary spring in the upright action is a repetition spring which allows for a very fast repetition. The same system was used in some North American brands such as Bell (Guelph) Jurgen Goering Piano Forte www.pianofortesupply.com ...................................... Terry wrote: Those conferences are a waste of time - totally useless. Unless of course you really value accessibility to cookies and brownies! You're certainly NOT going to learn a darn thing about pianos at them. And I'm really quite surprised that those books would be available there...... ....And what do those springs do? Simply add more spring in the same manner as the more common coil jack spring? Terry Farrell -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20121031/e3dba587/attachment.htm>
This PTG archive page provided courtesy of Moy Piano Service, LLC