I'm NOT lecturing anyone...I'm not to that point (yet?), and I can't yet properly empathize...so (yup) SOME of these suggestions would well be off-base/misguided/ignorance-based.
If four of five pounds of difference actually would make a difference (because "four valves" is going to probably mean that 25 lbs. (35 w/bag) has become more than someone believes they can manage to carry (assuming that they do not own a 30 lb. tuba, as the overwhelming majority of tubas weigh under 25 lbs.) and they (very much wishing to continue to play) are look for any sort of burden relief...
- First, consider the possibility of PERSONAL weight loss (if one's own personal weight is more than it was when 25 or 30 years old). If carrying 25 lbs. (35 w/bag) is getting to be difficult, but carrying 20 lbs. (30 lbs. with bag) would actually be noticeably easier, maybe (??) lose the weight off of one's OWN body, and just KEEP the beloved tuba.
- If not, one of the very few "lightweight YET four-valve YET large-bore full-size YET commonly-found tubas" is a Cerveny 681 B-flat @ 17.5 lbs.
- Another "instead of selling a tuba an buying another one" idea would be to pull up to the venue door, drop off the tuba, park and walk back without having to carry the tuba all the way from the car.
- Another idea might be to take the tuba out of the bag (or just wrap it in a quilt) and carry the tuba (up on one's shoulder or what-have-you) - with NO bag nor case from the car to the venue. This automatically defines 8 - 10 lbs. less (bag) or 20 or more lbs less (case).
- If the problem is actually "air" (lung/breathing issues/etc.), maybe consider switching to euphonium. Yes, superstar euphonium players are expected to do all sorts of amazing tricks and stunts, but - generally (and again, other than some virtuoso euphonium band parts) euphonium is less work (and less air) than playing most tubas. Rather than playing a really small tuba with a small-tuba type of sound (as most really small tubas end up weighing as much as the Cerveny model listed at the top) with a community band, maybe just buy a euphonium, practice at home, and - eventually - transition over into the euphonium section. If some parts are too high or too fast, just count those measures and then come back in.
![Smilie8 :smilie8:](./images/smilies/e5006073.gif)
bloke "I know NOTHING, but note that I DO sell tubas, and this whole post is about AVOID BUYING a tuba."