DCIsky wrote: ↑Fri Apr 11, 2025 8:21 am
But for nerdiness sake: the most common customization of a Bach 42 is swapping out the valve. As a cost cutting measure (because they didn’t believe that large bore horns would overtake the medium bore 36 In popularity), Vincent Bach designed the 42 using the valve and gooseneck from the smaller Bach 36.
There is a little more to it than that. First off, Vincent Bach was notoriously frugal, maybe a result of nursing a small business through the Depression and diversion to war production, or maybe it was just his nature. There are lots of stories about this, and the Bach 42 being a re-worked 36 is one of the better-known ones. The other part is that Bach believed he'd already designed the definitive orchestral tenor trombone, and it was the model 36. (Even into the 1970s Bach's advertising brochures designated the 36 as a large-bore trombone. The 12 and 16 were medium-bore. The 6 and 8 weren't in production at that time.)
What's funny is that Emory Remington probably agreed to some degree. I've read that he explained standardizing on the 88H for his performance majors because he had no way of knowing who would become bass trombonists and who would become tenor trombonists. He assumed that they would acquire more specialized instruments (if they needed to) after they left school. In the meantime, a really good tenor-bass would served their learning needs. So he worked with Conn to develop a really good tenor-bass.
Of course most didn't change, or dropped the valve with an 8H rather than going to a 78H or a 36. Bach needed a large bore to compete, so he put his bass receiver on the 36 bell, trimmed that bell to 8½ inches, and mounted a .547 inch slide. All that tooling already existed. Voila--the 42 was born.