Date: 1926. (Drawing)
The New Wonder family of single, bell up Euphoniums consists of the 80I/81I (pictured here), 82I/83I and the 86I/87I (see separate page for the 86I). The 80I/81I are three valve top action instruments. The 82I/83I are three valve front action instruments. The 86I/87I are four valve front action. Even numbered instruments are low pitch, odd numbered instruments are high pitch.
What Conn said in 1926:
With a large bore and corresponding proportions, Conn Euphoniums provide that broad, voluminous tone which experienced artists always desire, and which is the the essential feature of difference between Euphoniums and Baritones. The breadth of tone is not gained at the expense of ease of "filling," however, for the hydraulic process of manufacture used in building Conn Euphoniums produces a perfectly smooth sound passage.