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Forked f vent

Author: KevinB
Date: 2010-03-13 12:19

Hi

I think the forked F vent mechanism on my Howarth S20C+TP seems to be misbehsaving.

Forked F's were sounding okay until a couple of weeks ago when they started to sound very wooly and soft. I was at a loss as to why this should be until I noticed something about the way the rocker that operates the vent is behaving.

Now forgive me if this is a little verbose, there's probably a one-line technical way to say this but I don't know the jargon

Okay, so the forked F vent is operated by the RH3 key being depressed (so long as others like low C, C# RH2 etc are not depressed) which lifts the pressure off a rocker between the natural F tone hole and the forked F vent thus allowing the spring of the forked f mechanism to open the vent hole.

What seems to be happening on mine is that whilst the pressure is released by the pressing of RH3, the rocker is stiff so the spring pressure of the vent key can't overcome it. End result, no opening of the vent and a pretty foul F.

If I operate the mechanism from the other end (i.e. lifting the pad off the tome hole) then the whole mechanism works fine all the way to closing the RH3 tone hole.

Also, if I finger forked F and then manually open the vent, opening and closing RH2 correctly operates the vent.

Finally, if I finger forked F and then manually open the vent, then release RH3 the vent closes as expected, re-depressing RH3 doesn't open it so it's definitely the first rocker (operated by RH3) that seems to be the culprit.

I've oiled the rocker, even gone as far as taking the rocker pin out and cleaning it (it was already clean so made no difference) and re-oiling but none of these make any difference.

Any suggestions?

Thanks

Kevin.

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