When I press the 1st and 3rd valve then let go of the 3rd it goes up slowly. This makes the notes sound muffled and very sharp. For an example, when I go from a D to a F the F doesn't come out until a second later.

hmm...that sounds extremely annoying. If you have taken out the valves and oiled them already maybe they need to be cleaned. Take them out and completely wash them in warm water. Then dry them and re-oil them, then when you put them back in make sure the angle at which you are pressing the valves down with your finger is straight and just try pressing down on the valves a few times really fast. I hope this helps; its the best advice I can think of at the moment. I know that when I got my bach strad it seemed as if it needed to be oiled as much as two or three times a day, and it seemed to help after I cleaned the valves. I know that new pro-model trumpets especially (I don't know what type of trumpet you play) have a tendency to when they are being broken in have microscopic shards of metal build up, which might have had somethin to do with it, but I don't know how much that has to do with your problem. But you never know, maybe you'll be lucky and cleaning the valves will do the trick.

hey this used to happen to me i found that taking my valves and placing them in position and twisting them over and over again in the tube, see some trumpets ecepcially cheap ones are very slightly too smallto accomodate the valves this hapened to me so by turning it over and over again i worn down the microscopic amount of brass that made the tube too small

dont quote me on this one tho im only a player not a brass expert!

I have a Yamaha YTR 43356 trumpet, which is listed under the intermediate section of the yamaha wabsite. I also bought it off of Ebay. (though not for some cheap price, 900ish, which sort of means that it's good )

Because the trumpet is second hand you may push down on the valves diffrently than the previous owner. Some people push down at a slight angle and some push straight down. When you push down at an angle you begin to wear down that side a little and if you push straight down you evenly wear down all of the sides but not as much as the angled push. so i guess you just need to first try and clean your valves and then just break it in. im no expert but i hope this helps.

Supposedly it was brand new, when I got it the trumpet was wrapped in plastic and the mouthpiece was too.

ok then maybe you just need to break it in. i am not a pro repair person or any thing but that is what i think.

hey i think i know whats wrong check the valve and make sure it doesnt have a dent it get stuck that way

if it has a dent it will stick alot but if not it just need to be broken out so keep klickin!

Could be a messed up horn.

i had the same problem the valve casing is probley dented or bent

hey

yep i know how you feel. and i can sympathise with you. When i bought my new trumpet (not the best of quality, but it's a Norton, and it's fairly good) i was very upset to find that my valves would stick. so we rang up our music dealers (silver keys and strings) and the guy there said it could be one of 4 things , 1) you need to oil them more
2) they need a good clean in luke warm soapy water
3) you've over oiled them (not sure if he knew what he was talking about with that one)
4) or you could be pressing down on the valve with a slight angle

so i've basically just repeated what these other guys have said, but now my trumpet doesn't do it, and all i had to do was change the angle i pressed down on them.
so be presistant, and just break it in.
-Lauralou

I build and test those trumpets, that horn did not leave the factory that way. How is the slide action on the first and third slides? If it is not free and fully functional the slides are probably causing the problem. With the Monel pistons there is rarely issues with them. Normally it is the valve casings that are causing the problem. It may need to be re-lapped, considering it was bought on Ebay and poor handling during shipping could of caused it. The YTR-4335A is a great horn so don't give up on it.

that happens to me quite often, but it goes away when I oil it usually.

you know what? Do you have those cheap valve guides? They're plastic, white, and they go bye-bye REAL QUICK!!!!! Hassle to get because the stores general don't get them!