hosted on condor3913
 Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info
MMD > Archives > February 1997 > 1997.02.26 > 16Prev  Next


Valve Travel
By John A. Tuttle

Hi All, I have only two things to say about valve travel and one suggestion. Anyone who has ever rebuilt a valve chest will testify to the fact that if the travel is over .040 inches, you can really hear the valves change state. It is annoying and severely detracts from otherwise enjoyable music. This is especially true of Dou-Art units because of the physical placement of the chest.

Secondly, Aeolian units with the plastic unit-block valves have an average clearance of .045 and they are very noisy. Tiss-tiss-tiss. I dislike that sound. Having worked on more than 800 modern Aeolians, I discovered a way to easily reduce valve travel to an acceptable level and significantly reduce the amount of effort needed to foot pump the unit.

This is so simple, I almost hate to give it away. I take a punching of tan pneumatic leather, exactly the same size as the sponge neoprene valve, prick a hole in the center, apply a small dot of Sobo to the top of the valve stem and push the punching through the exhaust port and on to the top of the valve.

The reduction in valve clearance (from .012 to .015 less than the original clearance) and the leather to plastic seal makes the valve much more quiet and significantly reduces the amount of effort required to foot pump the unit. And my customers love me (well they like me a lot).

Musically, John A. Tuttle (johntuttle@playercare.com)
Visit my Virtual Domain at: www.playercare.com

(Message sent Thu 27 Feb 1997, 04:09:11 GMT, from time zone GMT-0800.)

Key Words in Subject:  Travel, Valve

Home    Archives    Calendar    Gallery    Store    Links    Info   


Enter text below to search the MMD Website with Google



CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2022 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Pay via PayPal

No PayPal account required

                                     
Translate This Page