Allegro Piano Service

Jerry Raz, Piano Technician

​Fitting a grand piano leg with new plates


Humidity Control:

More than anything else, changes in humidity can cause a piano to go out of tune. Playing a piano can contribute to its going out of tune, but changes in humidity play a greater role. Because changes in temperature cause changes in humidity, it’s possible to minimize the effect of humidity on your piano by placing it on an inside wall, away from windows and heating vents, and keeping the room where the piano is located evenly heated in winter.

These measures will help. But a Dampp Chaser humidity control system, installed out of sight but right inside your piano, is the most effective means of regulating the humidity in the immediate vicinity of the piano. Not only will the system keep the piano in better tune, but it will prevent the long-term damaging effects of soundboard expansion and contraction that occur with humidity change. Jerry is a certified field expert for Dampp Chaser products.

For more detailed information visit  Dampp Chaser


Leg and pedal lyre repair:  

Jerry is one of the few piano technicians in the Bay Area with expertise and experience in repairing piano leg problems. Although vertical pianos can also have these problems, most leg problems occur in grand pianos. Often, someone will notice that the piano seems unstable or that one of the legs appears to be loose. This situation can be  dangerous and should always be evaluated and repaired. The problem often occurs in the metal plates that attach the legs to the piano. Either of the two interlocking plates may be cracked, or there may be other problems, such as weak or failed glue joints, or the wood may be crackedCaster replacement may be necessary as part of a leg repair job.

Structural pedal lyre repair requires many of the same techniques required for leg repair.