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We’re the bits supplied with conn 20j’s and the rest of the 20 series tubas the same as the 20k sousa bits?

Thank You. How much difference does the bit make?

I owned and performed extensively on several Conn 2XJ tubas. From my experience, it depends which lead pipe is on the tuba. Some of the later 2XJ tubas have a longer leadpipe.

I had a tuning bit, however I never used it. The 2XJs that I owned played great. Of course, a few alternate fingerings were required. Here are a few videos of me "practicing" on a Conn 25J: https://www.youtube.com/playlist?list=P ... -Iok_AA77C" target="_blank