The ornamental design for a combinationtube and headset of a stethoscope, as shown and described.
FIG. 1 is a top plan view of a combination tube and headset of a stethoscope showing my new design, in an environment;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a top plan view of the combination tube and headset of a stethoscope showing my new design removed from the environment for ease of illustration;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a right-side elevation view thereof;
FIG. 6 is a left-side elevation view thereof;
FIG. 7 is a front end view thereof;
FIG. 8 is a rear end view thereof; and,
FIG. 9 is a perspective view thereof.
The broken lines shown in the views are included for the purpose of illustrating portions of the combination tube and headset of a stethoscope that form no part of the claimed design.