Manufacturing Error on Diaphragma

[Richard Long]

hi,

here are two fotos of a diaphragma from 2441 with a little mistake on the dome. there is no hole in the dome. is the dia technical 100% o.k.? it works ok. Is it a manufacturing error, or a later becoming mistake ?

http://i227.photobucket.com/albums/d.../Bild022-2.jpg
http://i227.photobucket.com/albums/d...g1/Bild020.jpg

[Chas]

There should not be a hole in the diaphragm.

[Richard Long]

There should not be a hole in the diaphragm.

yes it sounds still

[Earl K]

The location of "said imperfection", suggests it was caused by a "slip" of a screwdriver into the dome .

If so, that's a "user error" ( by persons unknown ) not a manufacturers' error .

BTW, you'll never hear such a small nick .



Sorry

[SMKSoundPro]

Agreed! You'll never hear it, and now we are reminded again to use a NON magnetic screw-driver around these drivers!!!

Scotty.

[Steve Schell]

LOL, Earl I was thinking the same thing. Somebody went "oops", then removed the diaphragm and pushed the dent out with their fingernail. I've never done that of course...

[SMKSoundPro]

Nope, nor I...

[4343]

Nope, nor I...

Although it's odd that both my 2420 dia's have similar impressions. One came to me that way back in '83, but for $20 I did not complain as it matched the one I had...

[Beowulf57]

Even better: a screwdriver dented the dome of a D131 (honest I didn't do it!) and the problem was solved using pliobond and a q-tip stick to pull the dome back out. The pliobond was then removed very carefully with methyl hydrate and q-tips.

[Richard Long]

Even better: a screwdriver dented the dome of a D131 (honest I didn't do it!) and the problem was solved using pliobond and a q-tip stick to pull the dome back out. The pliobond was then removed very carefully with methyl hydrate and q-tips.

that´s a good idea ! is it possible to do it the same way with domes of 24xx ?


if you pay 500$ in germany for one good looking 2441, i think i have to await for a perfect dia !

[toddalin]

Not a screwdriver dent, but a lesson to anyone who replaces a diaphram.

Note that there are two dents and look at the spacing. I suggest that the person disconnected the input spade lug and let it go. These lugs have a ferrite basis! It was attracted to the magnet and the two "prongs" made the dent.

Been there/done that.

[Beowulf57]

that´s a good idea ! is it possible to do it the same way with domes of 24xx ?

In the case of the 24xx, I would probably remove the diaphragm from the unit and use a q-tip by itself to gently massage the dent out from behind. Provide a soft but firm support on the opposite side while you attempt this. I have not attempted this myself...so if anyone has experience, please pipe in. The difficulty with the D131 is that one cannot get behind the dome without removing it from the cone...hence the pliobond trick.

[Richard Long]

... and use a q-tip by itself to gently massage the dent out from behind. Provide a soft but firm support on the opposite side while you attempt this.

good idea

[toddalin]

good idea

You will not "hear" the dent as it is. Try to fix it and screw it up and you may not hear anything.

[Richard Long]

next question, are the fotos below showing 2441 Dias? They are fixed in a 2441 but it´s no alu dia. it´s manufactered in 1997 and has a number on the ring of the backside 61435

http://i227.photobucket.com/albums/d...1/DSC00939.jpg

http://i227.photobucket.com/albums/d...1/DSC00942.jpg

which fluid can i take to clean the smokerings on the backside of tthe dia??