Yamaha YEP-842S Owner's Manual page 12

Before You Play
In case you need to play the pitch of a specifi c note
higher or lower depending on the chord or musical
temperament, you can adjust the pitch temporarily
by operating the secondary main tuning slide with
your left hand as you play.
CAUTION
Hold the top of the U-shaped secondary main
tuning slide when operating the secondary main
tuning slide during your play to avoid injury by
catching your fi ngers in the gap between the pipes.
 About the 5th Valve Extension
(YFB-621/YCB-822 Only)
Th e YFB-621 and YCB-822 are both supplied with
an extension for the 5th valve that can be installed
between the 5th valve slide and the instrument's
main 5th valve tubing. The 5th valve lowers the
instrument's pitch. Th e 5th valve's pitch changes as
described below when the extension is removed.
Normally, the 5th valve is used in combination
with the 4th valve, etc., to correct pitch in the
instrument's lower range, however the pitch may
be slightly higher or lower depending upon the
mouthpiece being used.
• With the 5th Valve Extension installed
(as shipped from the factory)
YFB-621: 4/3 steps lower
YCB-822: 2 steps lower
5th valve extension
Instrument (5th valve slide)
• Without the 5th Valve Extension
YFB-621: 2/3 steps lower
YCB-822: 4/3 steps lower
5th valve slide
Instrument (5th valve slide)
12
 About the 1st valve slide
You can tune the pitch by sliding the 1st valve
slide with your left hand while pressing only the
1st piston.
Th e 1st valve slide is designed with a short length.
When you press the 1st piston during your play,
tune the pitch by sliding the 1st valve slide while
listening carefully to the sound. Th is playing style
is the one of characteristics of the B b /C front ac-
tion tuba.
Hold the top of the U-shaped each tuning slide
or valve slide when operating each tuning slide
or valve slide during your play to avoid injury by
catching your fi ngers in the gap between the pipes.
5th valve slide
(YCB-623/YBB-623 only)
1st valve slide
CAUTION