Hi !
What mouthpieces are you playing ?

a doug elliot XT L103 (equivalent to between a bach 3 and 4) with a G cup and 8 shank for large tenors (with an additional special shank just for my 88H)..
same rim, but with a C cup and a 3 shank for my small tenors.

Thanks !

6 1/2 for classical work, 12E for Lead in jazz band, I also use a 1C on my soprano.

a Bach 6 1/2... Conn CL 4...and a Bach 5G Megatone

for symphonic playing: Doug Elliot LT 101, GT, G8
for jazz: Monette TS6

Thanks ! Is it true that the sound is darker with a U cup than with a V cup ?

Bach 6 1/2 AL Megatone
Bach 15 C
Jettone (shallow cup)

Yes, it is true that a U cup will give a darker, more round tone. The V cup, on the other hand, will usually give more responsiveness and a more cutting tone, which is better for jazz.

MY big good old Bach 1 1/2 G, Im planning on going to the full 1G wich is about 28mm across, thats a bit more than an inch.

Jazz: Doug Elliott XT104N rim, D cup, D3 shank
Large Bore: Greg Black/Alessi 3.5M
Bass: Griego 1.25 Deco for orchestra, Rath B1.25W for big band

Lebanese Bass Bone, a 1.5G to 1G is a HUGE jump. You`ll feel like you`ve lost a lung and a fourth off of your high range. You should try a 1.25G first, as it will be a much easier switch.

mine is a 5g* (* means custom from manufacturer) Marcinkowitz (sure that is spelled wrong)
Basically its cup is the same diameter as a bach5 (less than 1 milimeter larger) but it has a narrow throat. Great for jazz LOVE IT LOVE IT LOVE IT. For symphonic it works great too great dark sound.