![]() ![]() ![]() It is surprising that we can figure it out to the extent we have. People think that dial calipers or the rod tools used to take dents out of slides provide accurate measurements. Occasionally an 18h would get a coprion bell but there isn’t an obvious distinguishing model number for it. Serial number SNAFU’s were common as well. The model number should be near the serial number. Conn also recycled model numbers and mis-marked horns. Conn serial numbers should be at least 6 digits and/or a combination of up to 8 letters and digits. The more models that get thrown in the pot the more confusing it gets. A 78h is medium bore and 88h is large bore. ![]() 2h, 4h, 6H, 7h, and 8h models can be found with linearly ascending bore sizes. Some model descriptions have loose correlation between other model numbers. I am not sure anyone has succeeded in figuring out how the fractional description maps to the decimal description. Early in the XX Century, the numbers had some meaning: a 4H had a #4 (0.485 inch, I think) bore, a 24H was a 4H with a ballroom bell (set back slightly to facilitate mute changes), an 8H had a #8 bore (0.547 inch), etc.Ĭderkson shows a 4h with a 2 1/2 (0.485) bore and an 8h with a 4 1/2 (0.547) bore. Also, Conn trombone model numbers are a mess. ![]()
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