matt g wrote: ↑Wed Jun 23, 2021 7:14 am… it also makes the crooks that much more durable…
Nickel silver is stiffer than yellow brass and is therefore also more "springy". It can take some abuse and return to its original shape. It is more difficult to lightly ding up but still crushes as easily as yellow brass. Slides that are very well aligned by the factory worker usually stay that way because the crooks are more forgiving of abuse. However, the price is that it is difficult to work out fine dents or flat spots without annealing or using a lot of pressure that yellow brass does not require.
matt g wrote: ↑Wed Jun 23, 2021 7:14 am… corrosion resistant…
Yes, if you clarify some things. it is very resistant to red rot, which is dezincification. There is little to no zinc in the various alloys of nickel silver, also called "white copper".
However, it still gets just as crappy from schmutz due to neglect. I have noted that NS-to-NS inner/outer slide tubes can freeze together much more easily (and can be more difficult to pull apart) when the grease is allowed to dry out
if the horn is not kept very clean.
In my opinion, the best combo of tubing metals for someone who does not keep their horn clean and well lubricated (especially when left alone for long stretches of time) is NS outers with YB inners. These have the added strength/rigidity of the NS on the outside, which takes the impacts and abuse, with the more forgiving YB inners that tend to not get so badly stuck in place. The aesthetics of NS outers is wonderful, but the inners do not matter in this way so much, so this is a good combination for most people and the standard for Miraphone tubas.
(NS costs about double the price of YB, so this is a great compromise for their standard kit to save the company a few bucks. The NS/NS valve sets are quite beautiful, and cost more because of the price difference of the basic materials, but are not the best choice, IMHO. Of course, I am a bit of an idiot, so my horns frequently have NS/NS slides, heh, heh…)
matt g wrote: ↑Wed Jun 23, 2021 7:14 am… more difficult to work/bend…
I have ordered a lot of NS parts from Miraphone to replace the YB stuff I had purchased at an earlier time. They come from the factory in raw form, with the tails from the hydraulic bow-out press still in place, with a completely unfinished surface that requires a good deal of sanding, burnishing, or buffing to make shiny. I can tell you from experience that these are frequently a little more crude-looking than the same parts in YB and take a lot more time to prep and finish. Leadpipes in NS have more telltale wrinkles from bending; it is difficult to bend NS without wrinkling it, and it is difficult to tap out the wrinkles due to the aforementioned springiness of the material, so more sanding must be done by the factory.
bort2.0 wrote: ↑Wed Jun 23, 2021 7:30 am… the nickel silver should pretty much last forever…
Yep. Every really old instrument I have had (or worked on) with a mixture of NS and YB (or the even softer GB or RB) had NS that was pretty much fully intact, whereas the YB sometimes corroded away or the edges crumbled off of tubes. I have not noted NS's propensity to crack like old YB, in fact, I do not remember personally coming across cracked NS, though I am sure it happens. I just don't have enough experience with it to know.
bort2.0 wrote: ↑Wed Jun 23, 2021 7:30 am…would only cost a few hundred more…
This is a bargain, so far as new tubas go. The material costs twice that of yellow brass. It takes more labor time to prepare. (Blowing out crooks in the press takes the same time, but cleaning up the parts takes more effort. Hand-bending a custom leadpipe costs a LOT. I have had two made for me and the pipe cost very little, having it bent to the normal forms is, of course, more. But to bend a pipe that cannot be put into the current forms (meaning hand-bent by eye) is very expensive. And to bend a leadpipe in NS by hand is very costly. I had a 188 pipe in NS bent to fit a 186 and it cost me dearly and took them two tries that I know of. I am guessing they had to take a couple of swipes at it and then sent me the best one, but it did not fit due to a misunderstanding of what I wanted. (I suspect the worker was unclear as we had to play an email version of "Telephone" through a few people, and the first version took a month to get here, and then they were on their long summer holiday, then we had to exchange photos and all that. Overall, from first order to final leadpipe took about half of a year. And it was worth it to me, as I have exactly what I wanted. But man, what a complex process it was!
If I ever purchased a new 188 with all NS from the receiver to the pretzel for only a few hundred more than the normal price I should be quite excited about it. ;-) The net takeaway is a horn that is very beautiful, very strong, and very resistant to dezincification.
I think that if Matt ends up liking the GB thing that he has an excellent tuba that is a keeper. If not, he has some really selling power as that horn, fixed up, is worth a good bit of coin, I think.