Author: clarnibass
Date: 2017-03-05 09:56
The bridge mechanism could be out of adjustment on a one piece instrument too. One of the top pads on the lower section (right hand stack) not closing is the most common reason for notes under G in the lower clarion to have problems. If F# is already problematic then the top pad is probably the one, which could happen from the bridge being out of adjustment or other reasons.
A Jupiter, even an older one, is probably not made in Taiwan and not crappy.
First thing you can try is move your fingers "up a pad", pressing the top pad of the lower section with your first finger and the other keys with the "wrong" fingers. This way you can play the notes (at least down to D) with pressure directly closing the top pad. Press very firmly (i.e. making sure the top pad is closing) and see if this solves or at least helps the problem.
If it doesn't, it could still be one of those pads not closing, since a leak isn't always overcome by pressing with more force.
Of course the problem could be something else, this is just the most likely cause that is pretty easy to check.
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