Sorry for the trouble to listen to the files, put them on the blog as advis=
ed. I understand your language poorly, you advise me to send them back for =
repair or is the whole series that seems to be affected? Thank you for your=
answer!
Antoine
http://braconnages.unblog.fr/
--- In bruce seifried <eclairengineering@=
...> wrote:
>
> Oh, man. I know this issue well. Unfortunately.
>
> Rather than trust my sometimes quirky memory, I will copy/paste part
> of one of my emails to my dealer:
>
> *********
>
> "Here's a recap of my MKH8020/8040 adventure:
>
> =C2=95 Original order was for one pair each of MKH8020 stereo set, and =
> MKH8040 stereo set. Order date 5/8/08.
>
> =C2=95 One of the 8020 omnis went bad on my first remote job. Intermitten=
t
> full output noise spikes ruined recording.
> This pair was replaced by Sennheiser on approximately 7/1/08.
>
> =C2=95 New pair of 8020's both went bad before my first job with them. Bo=
th
> initially had low-level crackly noise problems. One of them
> subsequently improved, but both were returned to Sennheiser for a
> refund.
>
> =C2=95 The 8040 pair were initially fine, and worked in my studio. They =
> were set up here prior to a remote job in October, and one developed
> the same low-level crackles that the second 8020 pair had. This noise =
> took about a minute to get going before manifesting itself, and was
> then continuous. These were returned to Sennheiser for a refund.
>
> I returned the 8020/8040 pairs for a refund reluctantly, since I did
> very much like their sound, especially the 8020s, but I no longer
> trust that these microphones are reliable enough for me to use in a
> professional situation.
>
> As a circuit designer myself, I will hazard a guess as to what might
> be the cause of these problems.
>
> If it were not for the intermittent full-level noise problem with the =
> first 8020 pair, I would guess that there was some form of
> contamination to the high impedance section of the pc boards happening =
> during manufacture, perhaps due to incomplete removal of flux during
> soldering. Another possibility is a bad batch of FETs or transistors
> sneaking into production. Less likely but still possible would be bad =
> capacitors. Obviously, I did not open these to determine for certain
> what the problem(s) was/were.
>
> However, I did notice that the small circular pc board located between =
> the two halves of the microphones was not firmly attached in place,
> and was not always accurately centered. In fact, in one of the mics as =
> initially received it was so far out of alignment that there were
> positions of rotation of the XLR assembly where the pin was barely, if =
> at all, making contact with the circular pc board trace. This might be =
> a design decision that should be rethought, at least to improve on the =
> dimensional tolerances involved."
>
> *********
>
> My dealer, Steve Remote at Aura Sonic, was a complete saint during
> this nightmare, and managed to get Sennheiser to completely refund the =
> cost of these microphones. I have refrained from going public about
> all this, since I had not seen any other mention anywhere of anyone
> else having these sorts of problems, and I was beginning to doubt my
> own sanity. I tried these mics with different mic cables, two
> different Sound Devices 702 recorders, the KORG DSD recorder, and the =
> outcome was always the same. Sennheiser denied that anyone else was
> having these problems. Apparently, I'm not insane, as is now apparent. =
> Yay!
>
> I feel your pain!
>
>
> bruce seifried
> eclair engineering
>
>
> On Sep 22, 2011, at 4:21 AM, vickipowys wrote:
>
> > All,
> >
> > Does anyone else have problems with periodic loud fizzing noise from
> > Sennheiser 8020 mics?
> >
> > Sennheiser replaced one set of mics ('faulty capsule' they said) but
> > the noise persists in the replacement mics despite me checking
> > absolutely everything by way of leads and phantom power voltage and
> > connectors etc. etc.
> >
> > Help please!
> >
> > Vicki Powys
> > Australia
> >
> >
>
>
>
>
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