C.G. Conn 10DY Professional Geyer Wrap French Horn Overview

The C.G. Conn 10DY Professional Geyer Wrap French Horn is a professional double horn built in the Geyer tradition, combining yellow brass construction, a small-throat 12” bell, and a direct-soldered mouthpipe for a warmer, more solo-oriented response than Conn’s classic Kruspe-style 8D lineage. Developed as a modern evolution of Conn’s professional horn design, the 10DY uses traditional Geyer taper, a .468” bore, string linkage, and a reversible fourth rotor to support advanced orchestral, chamber, and solo playing with comfortable resistance and clear tonal center.

C.G. Conn 10DY Professional Geyer Wrap French Horn Specifications

• Key: F/Bb double horn with reversible fourth rotor for F/Bb or Bb/F configuration
• Finish: Lacquered yellow brass
• Wrap: Geyer-style wrap
• Bore: .468”
• Bell: 12” small-throat bell
• Construction: All-brass construction with direct-soldered mouthpipe
• Mechanism: String linkage with adjustable finger hook and mouthpipe water key
• Case: Fiberglass case with soft-touch exterior
• Accessories: Original accessories including hand guard, valve oil, and Farkas MC mouthpiece
• Serial number: 657597

Condition & Setup

This C.G. Conn 10DY suffered some minor shipping damage the the brace, which has been repaired and restored. It has been professionally serviced, set up, and play-tested in our shop to confirm proper mechanical function, response, and playing condition. It includes the original case and original accessories.

Who the 10DY Professional Geyer Wrap French Horn Is For

The C.G. Conn 10DY is a professional Geyer-wrap double French horn designed for advanced students, collegiate players, orchestral musicians, and soloists who want a Conn-built horn with a warmer, more centered Geyer-style playing profile. Its yellow brass construction, small-throat bell, and traditional Geyer taper give it a focused response with comfortable resistance, making it suitable for players who value tonal color, flexibility, and refined control.

Within Conn’s professional horn lineup, the 10DY is distinct from the classic 8D concept because it follows the Carl Geyer design approach rather than the broader Kruspe-style tradition. The direct-soldered mouthpipe is a significant design feature: because the mouthpipe is soldered directly to the bell rather than braced in the conventional way, the horn has a different resonance pattern and response feel than many mass-produced professional horns.

Common Questions About the C.G. Conn 10DY

Is the C.G. Conn 10DY a professional French horn?

Yes. The C.G. Conn 10DY is a professional double French horn with a Geyer-style wrap, .468” bore, string linkage, reversible fourth rotor, and all-brass construction. It is appropriate for advanced study, orchestral work, chamber music, and solo performance.

How does the Conn 10DY differ from the Conn 8D?

The Conn 10DY uses a Geyer-style configuration, while the Conn 8D is historically associated with a Kruspe-style design. The 10DY’s yellow brass body, small-throat bell, traditional Geyer taper, and direct-soldered mouthpipe produce a more focused and warmer response compared with the broader 8D-style concept.

Can the fourth rotor be changed from F/Bb to Bb/F?

Yes. The C.G. Conn 10DY has a reversible fourth rotor, allowing the player or technician to configure the horn for either F/Bb or Bb/F operation depending on preference and playing background.

We are proud to be an authorized C.G. Conn dealer