In a message dated 97-05-09 00:40:18 EDT, you write: << How much of a factor can the backcheck play in fast repetition? I've heard that analogy before in Yamaha classes (backcheck wire "spring" sort of = rep lever) and can see some truth to it when you have a long note followed by a very short one. However, I don't think fast repeated notes (drum repetition) are affected by the backcheck. Vince Mrykalo >> Vince, I work in a situation where a Yamaha U1 is really put through its paces by a couple of players that DEMAND the utmost performance out of an upright. I have found that the backcheck angle and catching distance is critical. That is only part of the solution, when it comes to fast drum repetition. It seems that the jack limiting rail has to be as close as you can get without it causing problems. I also believe as I think you stated in an earlier post that the hammer return springs cannot be too strong. Also important is the blow distance and keydip. I have found that sometimes on certain Yamaha's the blow distance needs to be shortened up of their specs, there is a range maybe 45 to 48mm. Once all of these items are in balance, I am amazed at how fast that U1 will repeat. Doug Hershberger, RPT
This PTG archive page provided courtesy of Moy Piano Service, LLC