Jupiter 7c vs Bach 7c?

themeowing · Regular Member Joined: 08 Jun 2018 Posts: 11

I recently got a new trumpet with a Bach 7C mouthpiece. My previous one used a Jupiter 7C, and I assumed they would be the same size. However, after looking online, the Jupiter has a diameter of 16.45 mm, while the Bach has one of 16.20. Is this accurate and would it matter? Thanks.

Betelgeuse215 · Veteran Member Joined: 20 May 2015 Posts: 186

It does not mean they were measured from the same place. Do some blind tests and pick the one that sounds better.

TKSop · Posted: Sat Jun 09, 2018 10:06 am Post subject:

Forget stated sizes, Bach in particular are famously wayward but many makers measure in slightly different spots anyway.

The key is whether one of the two plays better...
The Jupiter will be a copy of a Bach, but depending on what era it could be rather different from a current Bach 7c - whichever plays best on the new horn, use that one.

O00Joe · Posted: Sun Jun 10, 2018 11:20 am Post subject:

Different manufacturers measure diameter at different spots down the cup. Due to this, something like a Curry 5, Bach 5, Stork Vacchiano 4, and GR 65 which are all comparable in diameter, have different listed specifications. For this reason, I trust what manufacturers say a size compares to rather than raw comparison charts. Another good to compare is the Kanstul Visualizer, however its selection is limited.

Ultimately, feel is what is most important. I actually have a couple Bach 7Cs and a Jupiter 7C. They seem identical to me so the best solution, as always, is for you to play test them!
_________________
1981 Bb Bach Stradivarius 37/25 ML raw - Laskey 60C
2003 C Bach Stradivarius 239/25A L silver - Stork Vacchiano 4C25C
2006 Bb/A Schilke Piccolo P5-4 silver - Reeves A adaptor - Stork SM SP6
Akai MPC Live II
Roland JD-Xi
Casio MT-68

DaveH · Heavyweight Member Joined: 20 Nov 2001 Posts: 3861

In my opinion and personal experience, I find that the only way to tell if a mouthpiece will work for me is by trial and error.

Measurements, specifications, and the experiences of others will not tell me if I can play any particular mouthpiece successfully.

In the absence of specific needs to the contrary, my advice to anyone who asks would be to start with a middle of the road, general purpose mouthpiece in the 3C to 7C range - using Bach labeling as a guide - and then see what happens.

I think measurements and specifications are not helpful at all, except in the most general sense to help determine the generalities of of large, medium, and small.

oxleyk · Heavyweight Member Joined: 12 Apr 2006 Posts: 4180

You're questioning a quarter-millimeter? Put the caliper down and go practice.

cheiden · Posted: Thu Jun 14, 2018 7:53 am Post subject:

In my experience rim shape, bite and alpha angle/undercut are as or more important than some arbitrarily chosen ID measurement. But because those are trickier to quantify you really have to go by feel and how the piece responds.
_________________
"I'm an engineer, which means I think I know a whole bunch of stuff I really don't."
Charles J Heiden/So Cal
Bach Strad 180ML43*/43 Bb/Yamaha 731 Flugel/Benge 1X C/Kanstul 920 Picc/Conn 80A Cornet
Bach 3C rim on 1.5C underpart