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In many 3 row chromatic button accordions the first and third row reed blocks inside can be switched.
If the reed blocks are simply attached with screws (most of the time they are, because the reed blocks need to be removed from the instrument sometimes for rewaxing, tuning, changing reeds, etc)
If the number of buttons of the first and third row are the same and the sound holes fit (they mostly are and do)
then switching takes only a few minutes, and you can change a 3 row b-system into a c-system, or vice versa.
Ive done this a couple of times.
This probably is why the B-Griff or b-system and C-Griff or c-system developed historically.
In many 3 row russian bayans with 100 basses or Western 3 row chromatic accordions , if screws and equal number of buttons, this switch can be realised easily.
See pics inside a Schrammelharmonika:
http://schrammelharmonika.nonfoodfactory.org/regelstein.html
On this page is a pdf thesis about the 3 row b-system Schrammelharmonika
Die Schrammelharmonika - Magisterarbeit von Andreas Teufel
It is in German, but has many pics and detailed info on the history and development of the 3 row Schrammelharmonika, a precursor of the b-system and c-system chromatic button accordion.
This video shows how easy it is to remove a reed block fixed with screws (but here its a piano accordion thats being opened):
How to Take Apart an Accordion : How to Remove Reeds from...
If the reed blocks are simply attached with screws (most of the time they are, because the reed blocks need to be removed from the instrument sometimes for rewaxing, tuning, changing reeds, etc)
If the number of buttons of the first and third row are the same and the sound holes fit (they mostly are and do)
then switching takes only a few minutes, and you can change a 3 row b-system into a c-system, or vice versa.
Ive done this a couple of times.
This probably is why the B-Griff or b-system and C-Griff or c-system developed historically.
In many 3 row russian bayans with 100 basses or Western 3 row chromatic accordions , if screws and equal number of buttons, this switch can be realised easily.
See pics inside a Schrammelharmonika:
http://schrammelharmonika.nonfoodfactory.org/regelstein.html
On this page is a pdf thesis about the 3 row b-system Schrammelharmonika
Die Schrammelharmonika - Magisterarbeit von Andreas Teufel
It is in German, but has many pics and detailed info on the history and development of the 3 row Schrammelharmonika, a precursor of the b-system and c-system chromatic button accordion.
This video shows how easy it is to remove a reed block fixed with screws (but here its a piano accordion thats being opened):
How to Take Apart an Accordion : How to Remove Reeds from...
