Capsules types and technologies

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Phil Allison <philallison@tpg.com.au> wrote:
>"Scott Dorsey"
>>
>> A small American manufacturer whose name I won't mention is using aluminum
>> capacitor foil for a diaphragm. This has a very high mass and results in
>> poor high frequency response.
>
>** So aluminised Mylar film as used in polyester capacitors has high mass
>??

No, not aluminized mylar film, but rolled foil, as used in older
film-and-foil types.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

 

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Bob Cain <arcane@arcanemethods.com> wrote:
>
>I'll bet that wouldn't be true near a sea shore. I had the
>original one panel Magneplanars and they had aluminum wire
>on the tweeter that worked great for years until I moved to
>a shore house on Dauphin Island in the Gulf of Mexico and
>they were each corroded through in one place in a couple of
>months. When I set out to repair them about six months
>later the breaks were numerous. Replaced it all with fine
>copper and Elmer's glue and couldn't hear a difference that
>I could remember.

As I recall _all_ of those MG-1 and MG-2 speakers did that. And I don't
know why the wire corroded so quickly, while the metallized film they are
currently using does not.

And I don't know why ribbon mikes don't have ribbon corrosion issues either.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

 

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"Arny Krueger"
> "Scott Dorsey"
<thecatspjamas@aol.com>
>
>>>> A small American manufacturer whose name I won't mention is using
>>> aluminum capacitor foil for a diaphragm.
>>>
>>> What is done to keep the aluminum from oxidizing?
>>
>> Nothing. Although come to think of it, this isn't all that serious a
>> problem with ribbon microphones... the ribbons don't get white and
>> crusty at all, even after decades. I don't know if the condenser
>> would have more of a problem since the materials is thinner, or not.
>
> Anodizing?



** Anodizing = a layer of insulation.




........... Phil

 

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"Phil Allison" <philallison@tpg.com.au> wrote in message
news:31ki0uF3c153cU1@individual.net
> "Arny Krueger"
>> "Scott Dorsey"
> <thecatspjamas@aol.com>
>>
>>>>> A small American manufacturer whose name I won't mention is using
>>>> aluminum capacitor foil for a diaphragm.
>>>>
>>>> What is done to keep the aluminum from oxidizing?
>>>
>>> Nothing. Although come to think of it, this isn't all that serious
>>> a problem with ribbon microphones... the ribbons don't get white and
>>> crusty at all, even after decades. I don't know if the condenser
>>> would have more of a problem since the materials is thinner, or not.
>>
>> Anodizing?
>
>
>
> ** Anodizing = a layer of insulation.

Agreed, but that just means you don't anodize the attachment points.

 

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"Arny Krueger"
> "Phil Allison"
>>>
>>>>>> A small American manufacturer whose name I won't mention is using
>>>>> aluminum capacitor foil for a diaphragm.
>>>>>
>>>>> What is done to keep the aluminum from oxidizing?
>>>>
>>>> Nothing. Although come to think of it, this isn't all that serious
>>>> a problem with ribbon microphones... the ribbons don't get white and
>>>> crusty at all, even after decades. I don't know if the condenser
>>>> would have more of a problem since the materials is thinner, or not.
>>>
>>> Anodizing?
>>
>>
>>
>> ** Anodizing = a layer of insulation.
>
> Agreed, but that just means you don't anodize the attachment points.


** Pure aluminium ( we say al - u - min - i - um ) oxidises with exposure
to air, but it has to be a very moist environment for it t become white and
encrusted, as would be the case with a vocal mic maybe.

If aluminised Mylar film is placed so the aluminium side is against the
metal frame of the capsule there is no problem.




........... Phil

 

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On Tue, 7 Dec 2004 10:55:56 +1100, "Phil Allison"
<philallison@tpg.com.au> wrote:

> Dorsey is actually not sure about any damn thing - but just loves to
>spread misinformation and waste other folk's time and money.
>
>
>
>........... Phil
>


This from a man who claims that you can add numbers to a harmonic
series and still hear the same difference tones.





Kurt "I actually own a Bode" Riemann

 

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On 7 Dec 2004 07:32:34 -0800, thecatspjamas@aol.com wrote:

>
>Arny Krueger wrote:
>> "Phil Allison" <philallison@tpg.com.au> wrote in message
>> news:31ki0uF3c153cU1@individual.net
>> > "Arny Krueger"
>> >> "Scott Dorsey"
>> > <thecatspjamas@aol.com>
>> >>
>> >>>>> A small American manufacturer whose name I won't mention is
>using
>> >>>> aluminum capacitor foil for a diaphragm.
>> >>>>
>> >>>> What is done to keep the aluminum from oxidizing?
>> >>>
>> >>> Nothing. Although come to think of it, this isn't all that
>serious
>> >>> a problem with ribbon microphones... the ribbons don't get white
>and
>> >>> crusty at all, even after decades. I don't know if the condenser
>> >>> would have more of a problem since the materials is thinner, or
>not.
>> >>
>> >> Anodizing?
>> >
>> >
>> >
>> > ** Anodizing = a layer of insulation.
>>
>> Agreed, but that just means you don't anodize the attachment points.
>
>I don't know how well anodizing would work. It hardens the surface and
>makes it much thicker than the layer of aluminum it is replacing. It's
>typically used on surfaces much thicker than this because of the amount
>of material needed to complete the process. For something this thin I
>would expect the whole foil to turn to oxide.
>
>Also I wonder if the dielectric properties of an oxide layer would
>effect the capacitance between the diaphragm and the backplate.
>Peter

... I have the opinion, that it is very hard to estimate a property of
an membrane by just knowing that it is of aluminium. There are so many
grades of an (alloyed) metal, with quite different properties and
qualities. Eg. it's the same with, say, Monel and nickel of B&K
microphone capsules and bodies: the question is which Monel and what
nickel: pure or alloyed and then which alloy. I believe these are the
most kept manufacturers' secrets.
In other words, one could make a perfect physical clone of a known
microphone (and as I see it, they are trying hard nowadays) and get
totally different results. I would not say better or worse ones --
just different...
Edi Zubovic, Crikvenica, Croatia

 

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"Bob Cain" <arcane@arcanemethods.com> wrote in message
news:cp3ebl02v27@enews2.newsguy.com...
>
>
> Scott Dorsey wrote:
> > <thecatspjamas@aol.com> wrote:
> >
> >>Scott Dorsey wrote:
> >>
> >>
> >>>A small American manufacturer whose name I won't mention is using
> >>
> >>aluminum
> >>
> >>>capacitor foil for a diaphragm.
> >>
> >>What is done to keep the aluminum from oxidizing?
> >
> >
> > Nothing. Although come to think of it, this isn't all that serious a
problem
> > with ribbon microphones... the ribbons don't get white and crusty at
all,
> > even after decades. I don't know if the condenser would have more of a
problem
> > since the materials is thinner, or not.
>
> I'll bet that wouldn't be true near a sea shore. I had the
> original one panel Magneplanars and they had aluminum wire
> on the tweeter that worked great for years until I moved to
> a shore house on Dauphin Island in the Gulf of Mexico and
> they were each corroded through in one place in a couple of
> months. When I set out to repair them about six months
> later the breaks were numerous. Replaced it all with fine
> copper and Elmer's glue and couldn't hear a difference that
> I could remember.


Does anybody have an idea how to repair the mid-low panels on my Magneplanar
Tympani I-D The aluminum wire in them is totally rotten and I can't justify
the expense of sending four panels over the Atlantic.

Predrag

 

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Predrag Trpkov wrote:

> Does anybody have an idea how to repair the mid-low panels on my Magneplanar
> Tympani I-D The aluminum wire in them is totally rotten and I can't justify
> the expense of sending four panels over the Atlantic.

Those are the push-pull versions, right? If they are single
sided, my method of simply replacing it with very thin
copper attached by white glue worked great. I've never seen
the push-pull to know if they can be disassembled to do the
same.


Bob
--

"Things should be described as simply as possible, but no
simpler."

A. Einstein

 

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Bob Cain <arcane@arcanemethods.com> wrote:
>Predrag Trpkov wrote:
>
>> Does anybody have an idea how to repair the mid-low panels on my Magneplanar
>> Tympani I-D The aluminum wire in them is totally rotten and I can't justify
>> the expense of sending four panels over the Atlantic.
>
>Those are the push-pull versions, right? If they are single
>sided, my method of simply replacing it with very thin
>copper attached by white glue worked great. I've never seen
>the push-pull to know if they can be disassembled to do the
>same.

Somebody used to sell a kit to do it, and I remember them discussing it on
rec.audio.high-end a decade ago....
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."