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Today I worked on a Hirsbrunner BBb tuba. I have looked all over the horn and have only found a serial number on the second valve casing, but no model number. The horn is 5 valve (4 piston, 1 rotor) and front action. Here is a picture of the horn (before I worked on it). Can anyone identify this horn?

I just looked at my old Custom Music catalog, and what you may have is an HB-2P. The HB-2P was made in CC or BBb; the CC model being more common.

Edit: now I see there was also an HB-4P. Says the HB-4P was modeled after the HB-21 CC. So it's unclear (for me) as there are no actual pics of those BBb models, just description.

toobagrowl wrote:I just looked at my old Custom Music catalog, and what you may have is an HB-2P. The HB-2P was made in CC or BBb; the CC model being more common.

Edit: now I see there was also an HB-4P. Says the HB-4P was modeled after the HB-21 CC. So it's unclear (for me) as there are no actual pics of those BBb models, just description.

HB-2P's have a tuning slide in the lead pipe, HB-21's do not, so maybe a 4P.

Yeah, this looks like an HB-21 to me. If the HB-4 is the BBb version of the HB-21, then that's probably it.

Dan Bradley