I finally picked up a Meinl-Weston euphonium.
For the nerds, it's a 551 stencil with a 80:20 "gold brass" bell.
Compared to some of the other makes, the bell (not just the rim or throat...the entire bell) comes much closer to the size of a French tuba bell, and (thus) the sound as well.
The compensating side (4th valve and tubing through the lower parts of the compensating piston) bore is
.669" - larger than the bore size of quite a few 3/4 BB-flat tubas. ...so - whereas the bore sizes of a currently-offered French tuba are 14.5mm to 15mm, my Meinl-Weston instrument's bore sizes are 15mm to 17mm.
I typically don't use a mouthpiece as large as a French tuba mouthpiece with it, but I DO have an Elliott contrabass trombone mouthpiece (which absolutely IS equivalent to the size of a French tuba mouthpiece) which WILL play it (and without distorting tuning).
I've sorta quit using my F tuba for Mendelssohn/Berlioz/etc., and use this Meinl-Weston "euphonium" instrument, though I DID use my F tuba - recently to play the Midsummer Night's Dream suite, because I was a guest/sub, and didn't want to show up (as a sub) and raise eyebrows. Just prior to that, I covered Gounod and Berlioz (two ophicleide works on one concert) with the Meinl-Weston euphonium.
I've seen people bad-mouth the intonation of these. There are some actual WRONG LENGTHS of tubing on them, which I fixed. Further, some of the slides ask for MUCH MORE pull than with other makes. Once I addressed these issues, I was/am able to EASILY play it with NO main slide gadget and with only the following concessions:
- The two lower G's are played with third valve.
- Often, I'll play the upper E-flat with 1-3 to flatten that pitch a bit (same characteristic as Besson).
...That's it.
Otherwise, mash buttons, blow, and pay attention.
I'm not anti-French tuba, but I have quite a few (though many here know of my "rule") instruments, and that's one more that I would have to master/maintain (playing-wise) and for very few applications. I'm not getting into a discussion with the bard o' French tuba, the Holy Unca, but - when playing pictures, I'm going to use FatBastard, and - for the graveyard body-wagon solo (no: NOT this huge Meinl-Weston euphonium, but my $100 Yamaha YEP-321 euphonium (a great instrument with only a 14.5mm bore, and a SMALL shank receiver) and some mouthpiece that might not even exceed the approximate size of a 5G...I wouldn't even discount the possibility of shoving a 6-1/2AL into the Yamaha (probably, though, a small-shank Schilke 51 - no letters). Pumping out that solo (to be heard - and distinguished over the low/minimal/growly Ravel orchestration accompaniment), I prefer the Yamaha - with it's smaller bore and NON-bucket mouthpiece. The resonance produced will reach the patrons' ears with less effort/worry/concern on my part. I like "not worrying" (putting oneself in a position to be concerned/worried/nervous when playing a solo is REALLY a bad idea), "not working my butt off", and just - well - playing.