If the Valves are vented where are the pinholes?

thezman · Post by **thezman** » Sat Jul 30, 2011 12:41 pm

I recently purchased a Tuba with vented valves. Today, I was at a lesson and my teacher asked me where they put the pinholes on the valves; and I havn't had the horn long enough to actually see where they are. So, if the valves are vented, where are the pinholes?

Rick F · Post by **Rick F** » Sat Jul 30, 2011 1:11 pm

I think you mean 'vented valves'. If the slides were vented they would leak all the time. If you're talking about vented valves, there is a tiny hole drilled through the valve that matches up to where the slide would be when the piston is at rest — or up.

imperialbari · Post by **imperialbari** » Sat Jul 30, 2011 1:58 pm

Vented piston:

http://www.flickr.com/photos/62772558@N ... 719245308/

SousaSaver · Post by **SousaSaver** » Sat Jul 30, 2011 5:18 pm

Great pic Klaus!

TubaSailor · Post by **TubaSailor** » Sat Jul 30, 2011 5:25 pm

I see in your signature you have a HB293 -isn't that a rotary horn? If it is, the vent hole will be through the valve casing between the legs of the slide, usually slightly above the middle of the valve (top to bottom) Nice horn -

thezman · Post by **thezman** » Sat Jul 30, 2011 7:08 pm

Thanks, a HB290 is rotary, the 293 is the same thing but in piston

Rick Denney · Post by **Rick Denney** » Sun Jul 31, 2011 4:18 pm

Piston valves are vented on the piston, while rotary valves are vented through the casing.

If there are no holes on the pistons across from the valve-tubing port when the piston is not depressed, then the valve is not vented. Do a pop test with the tuning slide to be sure. If you push the slide in and out quickly, you should be able to hear and track the hissing of a vented valve.

Rick "knowing where to look" Denney

TubeNet

If the Valves are vented where are the pinholes?

If the Valves are vented where are the pinholes?

Re: If the slides are vented where are the pinholes?

Re: If the Valves are vented where are the pinholes?

Re: If the Valves are vented where are the pinholes?

Re: If the Valves are vented where are the pinholes?

Re: If the Valves are vented where are the pinholes?

Re: If the Valves are vented where are the pinholes?