E.F. Durand TB-1000N / JinBao JBSL-800N Large Bore Tenor Trombone

Instrument Type: Large Bore Tenor Trombone
Stencil Model Number: E.F. Durand TB-1000N
Manufacturer Model Number: JinBao JBSL-800N
Reference Model: Blessing B88-O
Price: $114.95 ($259.95 New via USA Music Supply)
Purchased From: eBay
Purchase Date: November 7, 2011
Bore Size (inch): 0.547
Bell Size (inch): 8.50

Material: 22 Gauge Brass
Finish: Nickel Plated 

I bought this trombone used on eBay...at around $100, curiosity got the best of me. I believe the previous owner used it primarily as a marching instrument(do to the random high school fight song sheet music that was in the case). Despite the usual wear and tear, it was still in pretty good shape. The construction of the horn seemed solid and nothing was loose. As with any nickel plated instrument, the finish seems to turn "cloudy" REALLY fast with constant use. 

The only similar instrument to this one design wise is the Blessing B88-O. They share the same attachment wrap design, but the Blessing has the addition bell brace, while this model has an attachment brace at that ferrule on the side. 

Compared to the other JinBao large bore tenor(the Bach LT42BO clone) this one is definitely a step down and would be considered an intermediate instrument. The 1001/42BO has the angled rotor and attachment which leads to less bends and subsequent bend loss throughout the tubing. As mentioned earlier, this model lacks the additional bell brace. But the obvious difference between the two instruments is the slide construction. The action on the 1001/42BO slide is ALOT better. While the slide on this instrument isn't HORRIBLE, it can be scratchy in places. 

When it is all said and done, this wouldn't be a bad instrument to use for marching band or a step up instrument...but at the same time, there is a huge upgrade in quality for only about $50 more to the aforementioned LT42BO clone. 

Now, on to the pics:

 Figure 1. Linkage

Figure 2. Side View

 Figure  3. Rotor and Lever

 Figure 4. Tuning Slide

Notice the missing bell brace. The smaller lateral brace has been install on the ferrule in its place.

 Figure 5. Rotor and Lever

 Figure 6. Bottom

 Figure 7. Side View, 1000 and 1001 Comparison(1000, 1001, top to bottom)

 Figure 8. Top View, 1000 and 1001 Comparison

 Figure 9. Bell Etching

 Figure 10. Opposite Side View, 1000 and 1001 Comparison

Note the difference in attachment tubing placement and angle.

 Figure 11. Slide Comparison (1001, 1000 left to right)

Note the difference in the width of the slide crook.

Figure 12. Slide Receiver Comparison (1000, 1001, left to right)