Hopefully I'm posting some solos you don't already have.

Trumpet:
Summer Suite - Bartholomew. Movement 1, "Popsicle Rocket Sunrise" just became my new go-to for a first time Class 1 solo.
Andante and Allegro - Ropartz
Petite Piece Concertante - Balay
All 'Antica - Goeyens
Suite - Gibbons/Cruft (play the first 3 mvts.)

Horn:
Inspiriation - Wendt. The entire solo is playable, but you only have to either play from the beginning to letter E, or from letter E to the end.
Rondo in Bb - Cooke
Pavane pour une Infante defunte - Ravel (Solos for the Horn Player)
Reveries - Glazounow (Solos for the Horn Player)
Concerto No. 1 - Mozart (play first or last mvt.)

Tenor Trombone:
Concert Rondo - Mozart/Ernst
Sonata No. 6 - Galliard
Sonata No. 1 - Galliard
Petite Piece Concertante - Balay/Voxman (Concert and Contest Collection for Baritone)

Bass Trombone:
Trigger Treat - Hoffman
Sonata - McCarty (play mvts. 1 & 2)
Concertino Basso - Lieb
I believe you can still use any class 1 Tuba solo as well.

Euphonium:
Largo and Allegro - Marcello/Merriman
Andante and Allegro - Ropartz
Sonata No. 6 - Galliard
Sonata No. 1 - Galliard
Petite Piece Concertante - Balay/Voxman (Concert and Contest Collection for Baritone)

Tuba:
Concertpiece No. 1 - Vaughan
Variations on a theme of Judas Maccabeus - Beethoven/Bell
Air and Bourree - Bach/Bell
Concertpiece - Painpare'
Sonata No. 1 - Marcello/Little
Ricercar - Gabrielli/Morris