TromboneChat

Available somewhere?

Can you elaborate on what you are looking for?

An assembly with leadpipe, tenon, cork barrels, and two inner tubes?
Just replacement inner tubes?

If the former you might just want to look for a whole slide assembly. Might be easier to find.

I had a tech replace 79h inners for me. I think he used new Conn 52h tubes.

hyperbolica wrote: ↑Sun Aug 25, 2019 7:58 pm I had a tech replace 79h inners for me. I think he used new Conn 52h tubes.

Thanks!... The horn in question is a 1921 model all red brass with a 7 1/2"bell...stunning sound.. I would like to keep as much as possible original so ideally ; only new inners.. I know that M/K drawing offer 525 inner and rose brass outer tubes(Bach 36), but would ofcourse prefer to keep the heavy original outers.. Btw!, "the Conn loyalist" states that a 1926 model 78H has a '517bore..In that case i would have to also change outers also.. The slide itself would be great if it wasnt for the inner slide plating which is worn and are not chrome plated like more modern slides..

Trond

Oooh. Sounds like a beauty of a horn. That slide isn't really playable, though, is it? Maybe contact Noah at Brass Ark. He loves the '20s Conns.

hyperbolica wrote: ↑Mon Aug 26, 2019 6:58 am Oooh. Sounds like a beauty of a horn. That slide isn't really playable, though, is it? Maybe contact Noah at Brass Ark. He loves the '20s Conns.

If the innerslide was smoother the slide would perfect.. It looks like the stocking are soldered on.. Havent had the opportunity to measure the bore..

You may just have another slide made, just so you can use the horn. . No one makes tubes in .522, and certainly not .517.

Tbarh wrote: ↑Mon Aug 26, 2019 2:39 pm If the innerslide was smoother the slide would perfect.. It looks like the stocking are soldered on.. Havent had the opportunity to measure the bore..

Make sure to measure the stocking OD. That's the important dimension when you're looking to replace inner slide tubes.

JohnL wrote: ↑Mon Aug 26, 2019 4:03 pm

Tbarh wrote: ↑Mon Aug 26, 2019 2:39 pm If the innerslide was smoother the slide would perfect.. It looks like the stocking are soldered on.. Havent had the opportunity to measure the bore..

Make sure to measure the stocking OD. That's the important dimension when you're looking to replace inner slide tubes.

This! Don't worry too much about bore sizes published on the internet. If you're replacing the inners and not the outers, the outer stocking diameter is what you need to match. That can vary quite a bit, even on slides that are ostensibly the same bore size. The Allied catalog actually lists the outer stocking diameters for replacement inner tubes that they sell. That sounds like a really special horn; would be nice to preserve as much of the original as you can.

Thanks for these good advices.. I will consult with my tech and measure the outer diameter of the stockings..

Trond

Benn Hansson is working on a 78H/79H slide rebuild for me and the inners are the challenge. The inners were replaced but are too small for the outers (look like the original 1972 pieces). It is looking like M&K might be the place to get them. The bigger challenge is the additional length of the slide used on the 78H/79H. I will post back when I get an update.


Also worth noting - I had a set of NOS 78H inners that I sold at considerable profit and now wish I had kept them.

Trav1s wrote: ↑Tue Aug 27, 2019 5:33 am Benn Hansson is working on a 78H/79H slide rebuild for me and the inners are the challenge. The inners were replaced but are too small for the outers (look like the original 1972 pieces). It is looking like M&K might be the place to get them. The bigger challenge is the additional length of the slide used on the 78H/79H. I will post back when I get an update.


Also worth noting - I had a set of NOS 78H inners that I sold at considerable profit and now wish I had kept them.

Interesting!.. M/K drawing offers rose brass tubes for Bach 36.. At least that way it would LOOK like it is original.. The original outers are probably heavier and made of a special alloy that Conn used for slides for a long time.. This (mine) horn plays a bit flat so shorter tubing may not be a big problems... Maybe they could custom make longer... Dont know..

Trond

Still at it! ... If i Were to change outers also, and go for M/K drawing rose brass bach 36 tubing(re the above post) the length of the tubes would be different i suppose.. Have anyone here compared the slide length of a Conn 78H and a Bach 36?... Also, would they(M/K drawing) be able to custom deliver the actual length?... From Your experience, please!

Trond

Who would be doing the slide build? MK will send tubes that are not trimmed (if you ask) so they can be cut to whatever length they need to be.

Here's an example of a '40s 36 next to a '50s 79.
The 79 inners are just over 5/8" longer, I have a 78 with replaced inners that's about 1/8" shorter(I'm guessing they were 52 inners).
The geometry of the slide in general is different (see the pics of the crook and the upper end of the outers).
Both outer diameters of the stockings are just about spot on .555.

hornbuilder wrote: ↑Tue Nov 05, 2019 7:05 am Who would be doing the slide build? MK will send tubes that are not trimmed (if you ask) so they can be cut to whatever length they need to be.

Thanks!... Thats reassuring.. My technician are TOP notch.. Markneukirchen taught and the Official Norwegian Yamaha "tweaker"... And my trumpetvwingman in my brass quintett..

Jimkinkella wrote: ↑Tue Nov 05, 2019 1:44 pm Here's an example of a '40s 36 next to a '50s 79.
The 79 inners are just over 5/8" longer, I have a 78 with replaced inners that's about 1/8" shorter(I'm guessing they were 52 inners).
The geometry of the slide in general is different (see the pics of the crook and the upper end of the outers).
Both outer diameters of the stockings are just about spot on .555.
IMG_1525.JPGIMG_E1526.JPGIMG_E1530.JPG

Thanks, Jim!
One of my concerns are the age of my horn ( 1921) and the thickness of the tubes.. But this are helpful info..

Trond

I just dug out a 1927 42H (the TIS version of the 78), outside diameter of the inners is the same.
Technically a .525 and the geometry is wrong, both tubes don't fit together.
But the individual parts work very well together.

hornbuilder wrote: ↑Tue Nov 05, 2019 7:05 am Who would be doing the slide build? MK will send tubes that are not trimmed (if you ask) so they can be cut to whatever length they need to be.

I'd guess both inners and outers? Time to save up for the next portion of the project.

Trav1s wrote: ↑Wed Nov 06, 2019 10:35 am

hornbuilder wrote: ↑Tue Nov 05, 2019 7:05 am Who would be doing the slide build? MK will send tubes that are not trimmed (if you ask) so they can be cut to whatever length they need to be.

I'd guess both inners and outers? Time to save up for the next portion of the project.

The outers are very special... Would sure like to keep them.. The slide action are pretty good right after "trombotining"... Which tells me that the outers are pretty good..

This is a transition horn... Serial is 1972 Benn Hannson thinks it was a Texas build. He noted the color of the brass looks different than the outers on my '69 79H.

Jimkinkella wrote: ↑Tue Nov 05, 2019 3:42 pm I just dug out a 1927 42H (the TIS version of the 78),..

Wow, not to derail the 78h discussion, but that (42h) is one horn I'd like to take for a spin one day. Maybe not enough to try to find and buy one, but it would be cool if you wanted to sit in on a quartet rehearsal and bring it along. Did they happen to make an F attachment version?

The 42h is interesting.
It has a very unique sound, almost more like a dark 36, but blows really easily and as expected.
If you're ever around L.A. you're more than welcome to check it out.
It's probably available for sale as well, as I never play the darn thing anymore.