This instrument is a "full" (not compensating) double, requiring no compromise of intonation on valve combination, as is the case with compensating designs. The fifth valve is a Bb-F rotor. The fourth valve is a muting valve that lowers the horn 3/4 step to bring stopped horn mutes into tune; no transposing is necessary. Extra fourth slide puts Bb horn in the key of A, so written E horn parts do not have to be transposed.Specifications: Key F-Bb/High F, Pitch A445 with independent tuning F, Bore 11.89mm (.468"), Lever action Mechanical ball action; nylon socket has set screw to adjust end play, Valve rotors Tapered hand-lapped brass, Bearing Plate Tapered brass, Material Brass branches and crooks with solid nickel silver connecting ferrules, Slide Both inside and outside hand-lapped brass, Bell 12.25" diameter large-throated hand-hammered yellow brass, detachable, Waterkey One on mouthpipe an one on main branch.
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