Need advice on Greg black mpcs

ttf_Solidshi · Post by **ttf_Solidshi** » Thu Aug 31, 2017 11:38 am

Hi！I've played my Greg black 5GSD medium weight one for 2 years nowRecently,i tried a GB NY 5.25 M and found it blows more freely than my 5GSD but the rim is a little large for me So now,I feel my 5GSD plays a little tight and bright So should I modify my 5GSD 's Throat or backbore,or just order a custom GB 5G with a more open (bore,backbone,throat)?

ttf_Full Pedal Trombonist · Thu Aug 31, 2017 11:51 am

Perhaps just get a NY series that had a rim you like more. Do they make a 6M?

ttf_Gabe Langfur · Post by **ttf_Gabe Langfur** » Thu Aug 31, 2017 2:25 pm

The NY 5 series has the same size throat as the standard series, but with a different backbore.

Why not buy a standard 5G? It will be relatively easy to find and easy to resell if it's not right.

If the cup is too deep for you, then you'll have to contact Greg. My recommendation would be a 5GSD with a #1 backbore (I believe this is what's in the NY series), but check with him.

ttf_Solidshi · Post by **ttf_Solidshi** » Sun Sep 03, 2017 9:04 am

Just tried a GB 5G，still feel it was a little tight when I blew so which part of the mpc should I do the custom,a more open backbone or a larger throat? And I knew GB backbore1 is smaller than standard backbone 2 but why the NY blows more open than the standard series?

ttf_harrison.t.reed · Post by **ttf_harrison.t.reed** » Sun Sep 03, 2017 9:14 am

The throat bore is just part of the equation. Sure, at the narrowest point they might both be .281", but I'll bet the where the cup enters into the throat on the NY, it is much more open, as well as yhrough the backbore.

ttf_Solidshi · Post by **ttf_Solidshi** » Sun Sep 03, 2017 9:38 am

So i may need a more open backbore -backbore3 ？

ttf_Full Pedal Trombonist · Sun Sep 03, 2017 1:23 pm

Get a NY5G threaded with a standard 5G rim?

ttf_Gabe Langfur · Post by **ttf_Gabe Langfur** » Sun Sep 03, 2017 1:30 pm

Quote from: Solidshi on Yesterday at 09:38 AMSo i may need a more open backbore -backbore3 ？

Probably not that.

ttf_harrison.t.reed · Post by **ttf_harrison.t.reed** » Sun Sep 03, 2017 2:56 pm

Probably the entrance to the throat on the cup side. You should be able to look at both and eyeball what's different.

For example on the Griego Alessi 1C, the throat is .281", and it seems like it is narrowest right where the cup meets the throat. On the 1A, it supposedly is .295", but it looks exactly the same width as the 1C. However, the entrance to the throat where it meets the cup is bored out. Much wider there than on the 1C. I have a hunch that what you're feeling on the Greg Blacks is similar, but you'd have to look and maybe do some of your own measurements.

ttf_harrison.t.reed · Post by **ttf_harrison.t.reed** » Sun Sep 03, 2017 2:56 pm

Probably the entrance to the throat on the cup side. You should be able to look at both and eyeball what's different.

For example on the Griego Alessi 1C, the throat is .281", and it seems like it is narrowest right where the cup meets the throat. On the 1A, it supposedly is .295", but it looks exactly the same width as the 1C. However, the entrance to the throat where it meets the cup is bored out. Much wider there than on the 1C. I have a hunch that what you're feeling on the Greg Blacks is similar, but you'd have to look and maybe do some of your own measurements.