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Alexander F extension

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An Alexander F extension with a manual rotary ‘tap’ to switch between the F extension and A.

 This gadget, a very useful addition to an Alexander Model 90 Bb/A+ single horn or an Alexander 107 Bb/A+/F alto, is made of lacquered yellow brass. 

 Although in theory the F extension gives ‘true and accurate’ intonation to only its open F notes, with some practice and experimentation with ‘longer’ alternative low-note fingerings, plus some ‘lipping’, it is actually possible to cover all the pedal notes of the F horn, but perhaps not in low register passages requiring some speedy agility.

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Alexander F extension