Which unusual instruments did Hector Berlioz use in Symphonie fantastique?

In his Symphonie fantastique, Hector Berlioz utilized an exceptionally large orchestra to achieve innovative tonal colors. Among the instruments featured were several that were considered new or unusual for the early 19th century, including:

• Ophicleide: A large, keyed brass instrument that served as the predecessor to the tuba.1
• Valve trumpet: Berlioz incorporated this then-modern advancement in brass technology to expand the orchestra's capabilities.1

Additionally, the work is notable for its expanded orchestration, which included doubling on the harp and timpani parts to create a grander, more complex sound than was typical for symphonies of that era.1