Can you guess this note? Perfect Pitch and Physics

For anyone confused on the pronunciation, timbre is a French word. "Tamber" is how it's pronounce it in French. (Well, it's "tambr-*ugh*" because.. French.)
Anyway, I'm a classically trained musician—all of my teachers were boomers or gen X—and I've heard it both ways my entire life, but mostly as "tamber". "Timber" usually tells me that the person saw the word before hearing it, that they were taught the anglicized pronunciation, or both

TL;DR - timbre is a French word and technically both "tamber" and "timber" are correct in English pronunciation