TromboneChat

I get the TIS for the open horn, but why the odd mechanism for tuning the valve section?
Otherwise, what do people think about this model?

There is no bracing whatsoever -- they probably put that there so you don't bork it by pulling at an angle other than 0⁰. Without the F attachment cross brace to push off of, any pulling on that slide will likely put torsion through the horn.

Is it some sort of stop set for a consistent E pull?

muschem wrote: Thu Jan 08, 2026 9:04 am Is it some sort of stop set for a consistent E pull?

That's exactly what it is. Tuba players often have something like that installed on their first valve slides.

I presume it lets you pull to E without guessing. The old Kanstul website advertises the model as as having a "Fast E Pull".
https://web.archive.org/web/20120414014 ... t=Trombone

You learn something new every day

Trumpet 3rd valve slides have the same thing.

harrisonreed wrote: Thu Jan 08, 2026 9:03 am There is no bracing whatsoever -- they probably put that there so you don't bork it by pulling at an angle other than 0⁰.

That's not correct. The thin cross brace is part of the tuning slide. The 1670 that I own had the E pull stop removed by the person I bought it from. I haven't really missed the stop. Here's a photo of a different 1670 with the stop removed (copied from Brass Exchange archives).

thank you!

dbwhitaker wrote: Thu Jan 08, 2026 9:49 amThe 1670 that I own had the E pull stop removed by the person I bought it from. I haven't really missed the stop.

I can understand why someone would remove it. I've had the pleasure of sitting next to someone playing a 1670 with a loose stop rod screw. I don't see how the rattle/buzz on certain notes didn't drive them insane.

I've seen trumpets with that sort of device on their main tuning slide; they were advertised as being playable in Bb or A (this seems to have been something of a fad in the 1920's and 1930's).

Closer to home, the optional Eb-D extension for the Olds P-24G had a stop rod on it.

My Reynolds Contempora "Philharmonic" (the single valve one) has one as well.