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Ampico B Unit Valves
By Bob Stewart 

There were two different valve sizes used in Ampico B valve blocks.  
Does anybody know why the change was made?  When the change was made?
If the sizes can be mixed in an instrument with no noticeable effect
on the playing?

Bob Stewart

(Message sent Fri, 20 Mar 2009 06:03:21 -0700 , from time zone -0700.)

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