> I wonder if anyone on the list has tried to measure the > "power loss" associated with wider let off dimensions? Very little power loss. What is more important is the pianist must lift the finger higher to get a repetition. The drop must be lowered a bit which increases "after touch" a bit. Mechanically speaking (supposedly) the action was optimized to function with a specific set of values for each adjustment. The reality is that the regulator needs to find those specs for that action. With a good set of rigid keys, stiff shanks, bedded keyframe, etc., the closer let-of can be. Given some actions have less good stuff the lower the let-off needs to be. I found an August Forester grand where the let-off could not be any closer than 1/8" or the hammers would block. I was not comfortable with that but I had no other choice. What spec is used is far less important that absolute consistency in the specs used. Newton
This PTG archive page provided courtesy of Moy Piano Service, LLC