My belief is that Conn made the best DB's and continued to do so until shortly after WWII. This is based on the knowledge that the Conn DB's were pretty much exclusively used in the military bands until Harold Brasch started the process of convincing the DC bands to switch to English style Bessons. IMO the best Conn's were 5 valve (short throw 30I or long throw 60I) front/front (ca. 1920s to 1940s)with the short leadpipe that connected directly into the valve block. These horns would have two sets of tuning slides whereas the earlier horns with the tuning loop in the leadpipe could potentially get by with one tuning slide. My experience playing this style horn was that played very much like a Conn 24i Connstellation, had a nice tone, good response, and the main section played well in tune.
I also have experience with the Holton DB (like Dave's and my own) and found it more difficult to play, had generally variable intonation, and more awkward to hold. It was great for TubaChristmas, but not too much else. Mine was a 1941 edition in top condition, so it wasn't the build quality of the horn, but more likely its design that was the issue.
King continued to make DBs even longer than Conn. The model 1160/1161 was manufactured from the early 1930s to at least 1963. The single bell version of this (2266) continues to be manufactured and is used exclusively in the Ohio State Marching Band. I suspect the King DBs were probably pretty decent but have never played one.
Doug
Adams E3 0.60 Sterling bell - Prototype top sprung valves
Concord Band
Winchendon Winds
Townsend Military Band
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