Original valves glued “in reverse”

[rcr27]

Few of valves for the lowest notes on this George Jones are glued down differently to the rest (i.e. with the tip facing outwards). This is only in the chambered side of the pan. Any particular reasons for it?

 

[Greg Jowaisas]

This can be a way to deal with stubborn valve flutter.  (I can't tell you why but sometimes it solves the problem!) 

 

Many of the Jones anglos I've refurbished used this treatment on a few of their valves.  I suspect it could be to address valve flutter or deal with the sometimes "less than ideal" placement of the vents beneath the valves that were too close to the chamber walls.

[d.elliott]

I have also seen this technique used where the chamber walls have developed a lean over the valve' 'air space' there is usually more clearance near the root of the reed. Of course there is the potential of a penalty in reed responsivness.

[alex_holden]

Interestingly it looks like they cut a notch in the left wall of each chamber to provide extra clearance for the tip of the valve.

[d.elliott]

I saw that too, this notching is not uncommon where the vent is close to the chamber wall. The situation that I refer to is when the chamber wall distorts leaning over towards the adjacent valve, sometimes pushed by the clamp & screws of the reed beside the wall.