PT-18 MRP F 4th Valve Slides

[apsapienza]

The 4th valve slides on my MRP F are too long (I think?) Neither end can be pushed in all the way without pushing the other end out by about 3/4 of an inch.

My question is, is this the way it was supposed to be designed, or is it a mis-cut on the tube's lengths?

Yes - I have tried reversing the tubes, they don't fit at all this way.

No - This is not an April Fool's Day related question.

Thanks

[michael_glenn]

Is it the slide pushing the other slide, or is it pressure? On my previous CC, my third slides would move each other due to pressure. Just had to hold the valve down.

[apsapienza]

No, the slides are definitely pushing each other. Double-checked just now.

[TubaZac2012]

I owned one of these for nearly 3 years, and I couldn't figure out why. I just figured it was a design flaw.

[bort]

Take the slide out, and hold it in front of the receiving tubing. Then you can see very easily if the ends of the slide tubing go too far down.

I know that some tubas are made with very long pulls for the 4th valve slides, but something sounds a bit unusual here.

Dumb question that might not even make sense -- are you sure you have the 4th valve slide in the 4th valve tubing? Not like you have the 3rd and 4th slides reversed or something?

[Tom]

It's not supposed to be like that.

Just look at this photo. All of the slides can be pushed all the way in, at least as far as I can tell...
Ref: http://www.b-and-s.com/download-brasswi ... -MRP-F.pdf

I agree with those that think you accidentally have some of the slides switched around incorrectly.

[apsapienza]

Bort, Bloke, Tom,

I tried every other side, including 5th, and they're all too wide or too narrow, none of them fit the 4th slide's tube width.

Switching the 4th top slide with the 4th bottom slide, the top slide sticks out about three inches when on the bottom.

I think the tube's too long.

TubaZac, I was wondering if you had the same problem on yours.

[bort]

Come to think of it, I think an old PT-3 I used to use had interchangeable 3rd and 4th slides... with the difference being the length of the slide.

[apsapienza]

Come to think of it, I think an old PT-3 I used to use had interchangeable 3rd and 4th slides... with the difference being the length of the slide.

My top 3rd valve slide is too narrow to fit, my bottom 3rd valve slide is too wide to fit :/

[TubaZac2012]

Bort, Bloke, Tom,

I tried every other side, including 5th, and they're all too wide or too narrow, none of them fit the 4th slide's tube width.

Switching the 4th top slide with the 4th bottom slide, the top slide sticks out about three inches when on the bottom.

I think the tube's too long.

TubaZac, I was wondering if you had the same problem on yours.

That's not why I sold the horn at all. Great playing horn, just didn't use it, probably will regret it down the road, but I just didn't need the horn. It plays great, regardless, FYI Mr. P's is like this as well.

[jsmn4vu]

The 4th valve slides on my MRP F are too long (I think?) Neither end can be pushed in all the way without pushing the other end out by about 3/4 of an inch.

Modification by a previous owner, perchance?

[apsapienza]

The 4th valve slides on my MRP F are too long (I think?) Neither end can be pushed in all the way without pushing the other end out by about 3/4 of an inch.

Modification by a previous owner, perchance?

Nay, I bought the horn new.

I'll check again, Bloke, but all the slides only fit one spot on the horn. Every other slide is either too narrow, or too wide to fit in any other tube.

[apsapienza]

Yup, first thing I tried fixed it. Top slide was in backwards.

Thanks!

Angelo "I should read the suggestion right the first time"