I have played Bass Trombone for about 30 years and for the last 20 of them have played a Yamaha 613-B through a Bach 1G mouthpiece (the mouthpiece has also lasted this length of time but desperately needs replacing due to internal corrosion). This bone has served me very well indeed and got me from the 4th Section to the 1st and knocking on the door of the Championship Section. I have fancied a change for some time now and by all accounts the open wrap design with less stuffy valves (hagmann, axial etc) seem to be the way forward. I am happy, for the most part, with my sound and will retain the Yammy but fancy a change, a challenge of exceeding my current playing standards on an instrument with a more modern design. There doesn't seem to be any new close wrap bones on the market now so I guess the open wrap is an evolutionary step. I have researched the vast amount of possible replacement bones and it seems to me that Rath make an exceptional product with great back-up and in a friendly, experienced way. I am well aware of the vast array of options for a custom-built bone (new Raths are all "made to measure") and will probably go for a red brass bell with independant axial valves and splash out on a Frosty mouthpiece. I wonder whether anyone has any advise they can share? This is my first thread so apologies if it isn't constructed too well. Many thanks in anticipation.