What are the failings of the Jin Bao 450L C-Tuba?

[Ulli]

Hello all,

I have the favorable occasion to buy a Jin Bao 450L C-Tuba.
But: What are the known failings of the 450L?

Best regards
Ulli

[Lectron]

Without discussing the sound, it is very much out of tune with it-selves.
3rd valve circuit for instance is quite a bit(!) too long

Haven't measured it, but judging by the sound it needs 2"+ off (~7cm)

[Ulli]

If I understand aright, I have to pull the main tuning bow about 7 cm, and shorten the 3. circuit a little bit to bring the 450 L right in tune?
That should be possible...

And what about the sound?

[NCSUSousa]

Ulli,
Here's a little help finding what's already been written/recorded on the JB 450L.
There is a review from both Jonathan/Wessex and Tom/Mack here: viewtopic.php?f=2&t=44077&start=61
It seems that you'll need to have some modifications (slide cuts) made to achieve proper tuning if you purchase one of these horns.
http://www.youtube.com/watch?v=CcqCnjvSTIM

[Lectron]

If I understand aright, I have to pull the main tuning bow about 7 cm, and shorten the 3. circuit a little bit to bring the 450 L right in tune?
That should be possible...

And what about the sound?

No....Language...It's all in the 3rd. The rest is pretty much all right I think
Neptune chopped ~5cm on 3rd, and that was not enough.

He has a chromatic scale on Utube
http://www.youtube.com/watch?v=CcqCnjvSTIM" target="_blank

You can hear the 3rd is still (probably if not bugle is messing up) flat