Yamaha YEP842TS Bb Euphonium

A main-tube trigger system offers precise pitch control as well as solid tone.

The lever plate can be pressed during a performance to shift the main tube tuning slide downward, lowering pitch by a precisely controlled amount.

Release the lever plate and the tuning slide returns to its original position.

To tune the instrument prior to a performance, loosen the rod base screw so that the main tube tuning slide can be positioned as required. The screw can then be tightened to set the trigger rod to the desired position.

The main tube tuning slides of euphoniums designed for trigger mechanisms have a rod base to which the trigger rod attaches. Additionally, the diameter of the main tube tuning slide inner tube is smaller than normal to ensure smooth trigger operation.

A special metal cover prevents the main tube tuning slide from coming into to direct contact with and possibly transferring oil to the player’s clothing. Loosen the attachment screw to adjust the position of the cover as required.