[Trombone-l] Duo Gravis -- what model???

[Eric & Candice Swanson]

emrose79 at sonic.net wrote:

>I think (which can be dangerous!) that the 1480, was orginally the 
>Synphony Bass, with a .536 bore and .562 trigger section. The 4B was a 
>.547 tenor (with large-shank receiver). The 4B(F) had a kinda unique F 
>section, with the tubing forming an X, which I found interesting at the 
>time. I'm guessing that the Duo Gravis was tweaked in the later '70s and 
>became the 6B Duo Gravis, which would explain why I saw a DG with the 
>split finger triggers.. the owner said that his parents had bought it 
>for him new a few years before (this was a few years ago)  Now... didn't 
>(doesn't) the Bach 36 have a .536 bore?
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Elliot,

The Dou Gravis, 6B, 1490, 2106, whatever you call it only had the double 
thumb triggers until the day it died.  If you saw one with something 
like a middle finger second trigger, then it was a custom job.  The man 
who owned it was just mistaken, or bought it used and didn't know it, or 
the music store converted the triggers before they sold it to him.

Yes, I believe you're right that the "Symphony Bass" was a smaller bore 
originally.  .530-something" sounds right.  It was KIng's only "bass" 
trombone until, I believe, about 1971 when the Dou Gravis came out.

The Bach 36 and 36B are .525" bore.

Eric Swanson