Yamaha YEP-842S Owner's Manual page 13

 Putting the instrument in the
case
Always store the instrument in its case when tak-
ing a break, during transport, and after playing.
Always remove and disassemble the leadpipe as-
sembly before placing the sousaphone or marching
tuba series instruments in their case.
* Th e bell on the euphonium or tuba may be posi-
tioned opposite of that shown in the above illustra-
tion depending upon valve position and case design.
 About the mouthpiece
Th e mouthpiece that is supplied with your instru-
ment is a standard mouthpiece. Th e mouthpiece
is designed to fit into the mouthpiece receiver
without being loose. Do not treat the mouthpiece
roughly, drop, or damage the mouthpiece, etc.
 About the Compensating System
Th e pitch of long tubular instruments such as the
euphonium becomes slightly higher than the true
pitch when multiple valves (the 4th valve in com-
bination with the 1st-3rd valves, etc.) are depressed
at the same time. Th e compensating system pro-
vides pitch correction in such cases. It also allows
the playing of fast passages in the low range with-
out having to change fi ngerings for the 1st through
3rd valves when the 4th valve is depressed.
The YEP-642/YEP-842/YBB-632/YEB-632 are
equipped with a compensating system.
The compensating system on the YBH-831 cor-
rects the pitch when the third valve is used in com-
bination with the fi rst and/or second valves.
Before You Play
 About the small hole on the side
of the piston
 Piston for the YCB-623/YBB-623
Th ere is one small hole on the side of each piston
to evacuate air in the valve case. After operating
a valve slide without pressing a piston, and then
when subsequently pressing a piston, a pop noise is
generated caused by internal pressure change. Th is
small hole can help prevent generating pop noises.
 Piston for the baritone YBH-831
Th ere is one small hole on the side of each piston
to maintain the rotation angle of each piston. Th is
hole is neither a vent hole nor a lubrication hole.
Vent hole
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