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"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: Bb/High F
Pitch: A445 with independent tuning F
Bore: 11.89 mm (.468")
Lever action: Mechanical ball action; nylon
socket has set screw to adjust end play
Valve rotors: Tapered hand-lapped brass
Bearing plates: Tapered brass
Material: Brass branches and crooks with
solid nickel silver connecting ferrules
Slides: Both inside and outside are hand-lapped
brass
Bell: 12.25" diameter medium-throated yellow
brass, detachable
Waterkey: One on mouthpipe and one on main
branch
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