bass button shifting

[Vlad the Polka]

Hello accordion players,

This is my first post. I've been playing the accordion 15 years from USA. I Recently bought a new old accordion. Giulietti F42. Great accordion with only a couple minor fixes I had to do but there's something I've never encountered before....

While I am playing one of the bass chord notes changes to a note not in the chord. Once I hit the register switch it goes back to the right notes. It is only that one chord the F. Anyone have any idea why that is happening and how to fix it? Strangely 2 f notes in the low and middle treble reeds needed valve adjustment.

many thanks in advance!

 

[debra]

If I'm not mistaken this accordion has melody bass that works without a large convertor switch. The implementation uses register slides to change between standard bass and melody bass. It's possible there is a problem with the register mechanism resulting in a note not being closed of completely when it should be. You could open up the accordion, remove the bass blocks and see the register slides in operation as you change registers.

 

[Vlad the Polka]

If I'm not mistaken this accordion has melody bass that works without a large convertor switch. The implementation uses register slides to change between standard bass and melody bass. It's possible there is a problem with the register mechanism resulting in a note not being closed of completely when it should be. You could open up the accordion, remove the bass blocks and see the register slides in operation as you change registers.

It does have the free bass c system with three switches for the voices. That's what I was thinking one of the slides must be moving possible because airflow or gravity perhaps. I would just think if it were there would be other chords that sound wrong but im not sure how the mechanism works. I will try that thank you!