This is a new Bach Stradivarius professional bass trombone made in Elkhart, Indiana, USA. This trombone was introduced in October, 2015. The new 50AF3 replaces the classic Bach 30T3 Thayer valve bass trombone.
The improvements in the 50AF3 include the new Bach Infinity axial flow valves. These have sealed cartridge bearings at the top and bottom of the rotor casing. This allows the rotors to pivot freely with less friction, less wear, and less maintenance. In addition, the bell is removable. This also simplifies maintenance and repair by allowing the bell and valve section to be separated.
Bell choices include yellow brass, gold brass, and a large 10.5" diameter yellow brass bell. The hand slide is a standard Bach design, .562" bore, fixed leadpipe, all brass with nickel trim. Custom options include a Bach "LT" lightweight hand slide of all nickel. This slide works particularly well with the gold brass bell.
We don't yet know if separate bells will be available as on the Getzen Custom 3062 bass trombones, but we have suggested it to our friends at Bach.
I/Steve find the new bass trombone case from Bach to be too weighty for my tastes. Thus our Bach bass trombones are sold as instrument only, without case or mouthpiece.