You want an F tuba that doesn't sound like a CC tuba, with pistons... yeah, very short list. I'm playing on a Yamaha 621, and yes, it is, shall we say, lean. I'll agree with the previous comment that it can be almost a euphonium. There's a lot on this thread I agree with, like the vintage B&S F-tuba sound is super cool, that the old Alexander F tubas had a killer sound if you got one that wasn't tuned by Satan himself, and that there are a lot of F tubas that are trying to sound like CC tubas. Me no likey.
The Yamaha 621 I have was the first F tuba, and one of the very few of all the F's I've tried, where C below the staff blew openly and consistently like the rest of the horn. Why do so many rotary-valve F tubas, and a few piston-valve F tubas to boot, have
"Low C Disease"? I have no idea, maybe it's just my lousy perception. I grabbed the 621 when I had the chance.
I'll also agree with making the horn sound like you want it to sound. Yes, the 621 is a peashooter. It doesn't sound like my 'Brunner, never will. However, I'm playing the thing all the time right now, doing quintet work, working up recital stuff, and using it for dixieland gigs on the road because it's the only horn I have small enough to go on the airlines without oversize charges (knock on wood--three round-trip flights and counting...) It takes some work getting a dark sound out of it, but it's in there. I can remember taking lessons with Jim Self when he was playing one of these horns, he probably chose to bring his 621 to Tempe, AZ, for the same reasons I take mine on the road. He was money on a 621. Money. Roger Bobo didn't sound too shabby on his 621, either.
There are lots of times I wish it had a bigger sound. However, I find that for every time I wish that, there's a conductor (choral or orchestral) telling me there's
still too much tuba,
or something blends really well in the quintet because it's not tubby, or I can really kick a lot of backside on a bass line because the intonation rocks on the Yamaha and all of the low register notes hit
right in the slot all of the time, every time, or I've just done a three-hour gig standing up and my back
isn't killing me... hey, tiny tubas rule!
(BLASPHEMY!! )
I
am shopping around, keeping my eye out for an F or Eb with a bit more beef than the 621. Of course, the criteria for a different axe are that it has to be as portable as the 621, have intonation as good as or better than the 621, a low register as locked down as the 621, play as consistently up and down as the 621, absolutely
NO LOW C DISEASE, and last but not least, I don't want it to sound like a CC tuba.
I've already got one of those.