Yeah yeah, different instruments, and what works on one might not work on the other just like we picky tuba players...
Anyway...

Roberts wrote: There was a time, when I first went out to LA...one of the big contractors who did most of the hiring, he worked for Bobby Helfer. He wouldn't really hire me at the very beginning because I was a jazzer. Oh, he thought that a jazzer couldn't play legitimate or semi-legit, like they do on motion pictures. Like, all these big pictures had Alfred Newman and Elmer Bernstein, and all that. He thought, George couldn't possibly do that.
So, I'm sitting at home one morning. This was a big turning point in my life, it really was. It was about 8:30 in the morning and I get this phone call, and this is how Helfer was (in a very business-like voice), Mr. Roberts, what are you doing right now. I replied, I'm having an unemployed cup of coffee. Helfer said, how long would it take you to get in your car with your bass trombone, your bag of mutes, and everything else that you carry and get down to Radio Recorder's Annex? How long will it take you to get down here? I said, about 40 minutes. Helfer said, get all your stuff, put it in the car and be at Radio Recorder's in 40 minutes. Buzzzzzz. And he hung the phone up. I thought, good Lord. I ran and got my stuff and put it in the car and I was there in 30 minutes!
I walked in the door and there's the LA Philharmonic sitting there. The bass trombonist had gotten up and walked out on Helfer and Igor Stravinsky. This is insanity, you just don't do that! Some of the players convinced Helfer to "try the new kid" (me). Anyway, I was told, get back there, sit down, and play. I went back, looked at what I had to play and I thought, well, all I can do is look at the part and count like heck. I had to play a solo with the harp, which was all the way across the room. I already knew that the sound delay was going to be a son-of-a-gun but Stravinsky began to conduct and we got a little way in and he stopped and said, he (George) is right and you're wrong (harpist) - play with him! We made the date that (snaps fingers) fast.
https://en.wikipedia.org/wiki/Arthur_W._Lehman wrote:In the late 1940s, Lehman worked closely with the British Boosey and Hawkes musical instrument company to produce a set of five custom-made silver-plated "Imperial" model Euphoniums which were used in the Marine Band for over half a century. One of these unique Euphoniums is owned today by one of Lehman's former students, Glenn Call.
Always looking for a darker, more powerful sound, Arthur Lehman also developed the deep, large-bore parabolic-cup mouthpieces generally known today as the "Lehman Special," a radical change from the shallower cup-shaped mouthpieces of earlier Euphonium soloists. With his performances on the Boosey and Hawkes Euphoniums and his "Lehman Special" mouthpieces, Lehman is widely credited for transforming the typical American Euphonium sound from the lighter continental sound of the John Philip Sousa days to the rich, dark and resonant sound common today
bone-a-phone wrote: ↑Mon Nov 30, 2020 12:36 pm I'm a tenor bone player, and play Doug Elliot stuff on tenor, 104 F-C on small tenor and 104 G on large tenor (considered big diameter, average cup depth). On bass, I play about 1 1/4G size, which is kind of medium size for bass. On euph, my preferred mouthpiece is 2G. This allows a good low range and a good high range. My large tenor mouthpiece feels small on the euph.
So yes, you can. Maybe I just don't have a very dialed in sense of what a euphonium should sound like. I know Mr. Werden is kind of horrified by playing big mouthpieces in a euphonium. I had a little discussion with him about it, and we just left it at we have very different ideas of what a euphonium does. He's a big time pro, and I'm ... not. So you can pick whose advice you want to take.
What are your goals? What are your abilities? I have a good high range and a not so good low range, so I tend to use large mouthpieces to help me where I need the most help. I can play the biggest mouthpieces I have on euph (Yamaha 60), and I don't think they make it sound bad, although they make anything over high Bb harder to play, and allow me to go to pedal C without much problem. With the same mouthpiece I can play lower on euph than I can on bass bone.