wima tropifol m polyester film caps -- will they degrade a..
Last response: in Home Audio
Archived from groups: rec.audio.tech (More info?)
I have an expensive U67 microphone that uses film caps in the feedback
path of the internal tube preamp.
I have changed the coupling electrolytic that was connected to the
trannie and the sound improved considerably.
I now wonder if the polyester caps have aged or degraded since they
were installed in the mic 40+ years ago.
I want to avoid taking the mic apart as much as possible, since it is
considered a 'vintage' mic and should be kept as 'original' as
possible.
If the caps do age and change sound, though, I will change them
regardless to have the mic as close to factory specs as possible.
anyone know??
I have an expensive U67 microphone that uses film caps in the feedback
path of the internal tube preamp.
I have changed the coupling electrolytic that was connected to the
trannie and the sound improved considerably.
I now wonder if the polyester caps have aged or degraded since they
were installed in the mic 40+ years ago.
I want to avoid taking the mic apart as much as possible, since it is
considered a 'vintage' mic and should be kept as 'original' as
possible.
If the caps do age and change sound, though, I will change them
regardless to have the mic as close to factory specs as possible.
anyone know??
More about : wima tropifol polyester film caps degrade
Archived from groups: rec.audio.tech (More info?)
As for the film itself, polyester is a stable material. It is affected by
few chemicals and there are no issues with aging. UV degrades it, but that
is a non issue in this application.
There could be other failure/degradation modes I'm not aware of that could
effect the capacitors. Sounds doubtful unless the capacitors were stressed.
John
"maxdm" <maxdimario@aliceposta.it> wrote in message
news:25150933.0407280322.60d120dd@posting.google.com...
> I have an expensive U67 microphone that uses film caps in the feedback
> path of the internal tube preamp.
>
> I have changed the coupling electrolytic that was connected to the
> trannie and the sound improved considerably.
>
> I now wonder if the polyester caps have aged or degraded since they
> were installed in the mic 40+ years ago.
>
> I want to avoid taking the mic apart as much as possible, since it is
> considered a 'vintage' mic and should be kept as 'original' as
> possible.
>
> If the caps do age and change sound, though, I will change them
> regardless to have the mic as close to factory specs as possible.
>
> anyone know??
As for the film itself, polyester is a stable material. It is affected by
few chemicals and there are no issues with aging. UV degrades it, but that
is a non issue in this application.
There could be other failure/degradation modes I'm not aware of that could
effect the capacitors. Sounds doubtful unless the capacitors were stressed.
John
"maxdm" <maxdimario@aliceposta.it> wrote in message
news:25150933.0407280322.60d120dd@posting.google.com...
> I have an expensive U67 microphone that uses film caps in the feedback
> path of the internal tube preamp.
>
> I have changed the coupling electrolytic that was connected to the
> trannie and the sound improved considerably.
>
> I now wonder if the polyester caps have aged or degraded since they
> were installed in the mic 40+ years ago.
>
> I want to avoid taking the mic apart as much as possible, since it is
> considered a 'vintage' mic and should be kept as 'original' as
> possible.
>
> If the caps do age and change sound, though, I will change them
> regardless to have the mic as close to factory specs as possible.
>
> anyone know??
Archived from groups: rec.audio.tech (More info?)
jriegle wrote:
> As for the film itself, polyester is a stable material. It is
> affected by few chemicals and there are no issues with aging. UV
> degrades it, but that is a non issue in this application.
>
> There could be other failure/degradation modes I'm not aware of that
> could effect the capacitors. Sounds doubtful unless the capacitors
> were stressed. John
What is Polyphelelene like ?
geoff
jriegle wrote:
> As for the film itself, polyester is a stable material. It is
> affected by few chemicals and there are no issues with aging. UV
> degrades it, but that is a non issue in this application.
>
> There could be other failure/degradation modes I'm not aware of that
> could effect the capacitors. Sounds doubtful unless the capacitors
> were stressed. John
What is Polyphelelene like ?
geoff
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