[Sasha Karbasov]

What do you think would be the correct key heights on a tt alto (tt with a roller g/front f)? I seriously hope that some experienced players and true tone owners/repair man will answer.. thanks

 

[jicaino]

What are you trying to "solve" by altering venting? What kind of MPC are you using? reeds? there's not "one correct" venting chart (although somebody posted a factory spec venting chart not long ago, search for true tone soprano key height)

 

[Sasha Karbasov]

thanks for reply. I am trying to have an alto in its perfect playing condition). Perfect in terms of tone, intonation and resistance. I have Vandoren a27, selmer soloist style d, stm 6.
I just expect that some experienced player who is satisfied with his tt and its venting will share some measurements (for example left hand - B, A, G, right hand F, E).
I have that chart that you've mentioned and it's nearly perfect (i had nearly come to the same results by myself...) but for some notes - my a1 is flat 10cent. And i;ve already cut all the cork on the G - body octave. Maybe i should replace the body octave pad for one that is thinner? Or are all the other key heights too high maybe?) excuse my english..

 

[Sasha Karbasov]

or maybe that chart is measured at the edge of cup? and that's why the heights are so big? somebody, please, help

 

[jicaino]

the chart is in 1/32ths. If you try to vent by the chart measuring in milimeters you're 25% off on the too open side (1/32" is roughly 0.8mm)

on the G issue, is the G pearl way below the A pearl when both ae closed? Meaning, it's kind of like the feel of a modern yamaha or other makes, where your left hand ring finger is loer than the middle finger? Perhaps the G key needs to be bent a little for get a correct vent height

 

[Sasha Karbasov]

sorry, i don't understand your explanation.. for example the chart says: for alto buescher B - 29, F - 42. So that means in mm..?

 

[Sasha Karbasov]

I think i've understood. If the chart says 42 then i should: 42*2.54*0.08? Right? (It would be 8.5mm for F in right hand)

 

[jicaino]

yes. Or you can skip the middle step and do 42 * .8

 

[Sasha Karbasov]

excuse me once more, but when you were writing the answer I've edited my post) (my "formula")

 

[jicaino]

(chart figure) * 0.8 and you're in mm.

 

[Sasha Karbasov]

the chart figure for F (alto buescher) is 42. If I do 42*0.8 it would be 33.6. So the opening for alto F would be 33.6 mm? hm... I think it's not right) I don't undestand something. Please explain

 

[Sasha Karbasov]

are we talking about this chart in the post #3?http://forum.saxontheweb.net/showthread.php?150266-TT-soprano-key-height

 

[jicaino]

No, that chart is expressed in decimal inches. 42 would be .420 * 25.4 = 10.6 mm

wich is large for an alto, unless you measure from the tone hole to the edge of the padcup, not straight to the seat impresison on the pad.

 

[Sasha Karbasov]

jicaino, can you give a link to the chart that is in 1/32ths? or simply measure the openings (to the seat) on a tt alto that plays well?

 

[jicaino]

It's been a while since I worked on a TT alto... Not today, not tomorrow, but during the week I can dig out one TT alto and see what kind of key heights I'd recommend.

 

[Sasha Karbasov]

thank you very much. Maybe I should ask someone else (by PM) to post their measurements here so we can compare them? Whom do you recommend?

 

[bruce bailey]

Trust Jicaino as he is the expert on these.
Another factor to consider is that these early horns often need to be set at a certain height to enable the G key octave pip changeover to work and the 1+1 Bb to operate. If the keywork is set too open, there will be play in the keywork at some point causing lost motion and clicking. Even more so on sopranos.

 

[Sasha Karbasov]

I still hope...