French horn in 1968, but that lasted only a couple of months. Hated dragging that thing home from school. Switched to tenor trombone and stayed with that throughout junior high and high school. Sorta taught myself euph along the way, but these were the usual bell-front Reynolds, King, and Olds horns. The only 4-valver (non-comp, of course) was a Reynolds. Enjoyed playing that horn, and also delving into treble clef in Bb, and also tenor clef. I still struggle with alto clef, but my viola-playing wife does not.
Have branched out into all the low brass instruments, tuba most often these days. Still playing 49 years later.
U.S. Army, Retired (built mid-1950s)
Adams E2 Euph (built 2017)
Boosey & Co. Imperial Euph (built 1941)
Edwards B454 Bass Trombone (built 2012)
Boosey & Hawkes Imperial Eb tuba (built 1958)
Kanstul 33-T lBBb tuba (built 2010)