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 Reactions from Dutch clients!
(Reparatie Audix SCX-25)
"Het is anderhalve week geleden, maar ik meld ook nog even dat de Audix zich weer uitstekend heeft bewezen in een “live” situatie. Nogmaals bedankt voor je vakwerk."
 
(Modificatie Devine BM-600)
"Na een grondige opnametest gisteravond kan ik concluderen dat de modificatie meer dan geslaagd is!
Ruisniveau is aanzienlijk verlaagd en het lijkt er zelfs op dat het hoog ook verbeterd is, de detailweergave is in ieder geval uitstekend."

(Reparatie Neumann U87)
"De U87 werkt weer perfect!"

(Reparatie Neumann KMS84)
"Hartelijk dank voor het fraaie werk en de uiterst schappelijke nota.
Ik ga ermee aan de slag, een eerste luisterindruk was, zoals verwacht, uiterst positief
."

(Reparatie SE2200A)
"De microfoon is ontvangen en werkt weer naar behoren. Bedankt!"

(Reparatie Neumann U87 en KM84)
"Gisterenavond heb ik de Neumann microfoons geprobeerd. Ze werken allebei weer als een zonnetje.
Heel hartelijk dank voor uw goede zorgen en vakkennis."

(Reparatie Neumann M147)
"De microfoon werkt weer prima. Ben er erg blij mee."

(Ombouw RØDE NTV naar solid-state electronica)
"Zojuist even een snelle luistertest gedaan met de NTV-fet!
Mooi geluid (ik mis de buis niet) en zeer ruisarm, ik ben er super blij mee!!"

(Reparatie Neumann KMS 105)
"De Neumann mike is aangekomen en perfect gerepareerd. Ben erg blij. Dank daarvoor."

(Neumann U87, defect kapsel vervangen)
"
Mijn complimenten voor uw vakwerk, wat een verschil. Nu snap ik ook wel dat ze duur zijn."

(Reparatie UA 6176)
"Het geluid is nu weer echt helemaal super. Geen ruis te bekennen en ik heb veel meer volume. Geweldig!"

(Reparatie
RØDE K2)
"Ik heb net even getest. De brom/static lijkt wel helemaal verdwenen. Ik heb enkele succesvolle tests uitgevoerd."

 (Reparatie
RØDE NT2)
 
"
Hierbij wil ik U complimenteren met betrekking tot de reparatie van mijn Rode NT2 microfoon. De ruis is totaal verdwenen en de microfoon neemt nu nog beter op."

(Reparatie RØDE NT2)
Ik heb vandaag de Rode nt2 uitgeprobeerd.  Hij doet het geweldig.  Bedankt daarvoor.

(Reparatie Omnitronic Tube c-10)
"Bedankt voor de vakkundige reparatie, ik kan nu weer genieten van het mooie geluid wat deze microfoon overbrengt."

(Reparatie SE2200A)
"Ik kan u melden dat de mic. 100% in orde is en heb zelfs de indruk dat hij beter klinkt dan voorheen.(dynamiek/helderheid).
Ik ben er erg blij mee en wil u nogmaals hartelijk
bedanken voor de uitstekende service."

(Reparatie RØDE NT1000)
"Hartelijk dank voor uw deskundige reparatie."

(Reparatie Studio Projets CS5)
"Bedankt voor de goede en snelle service."

(Reparatie Neumann TLM103)
"I received yesterday my mic and today i’m recording with it. It works perfectly. "

(Reparatie
RØDE NT2A)
"De microfoon heb ik goed ontvangen en uitgeprobeerd, hij doet het uitstekend en ik ben er heel erg blij mee. "

(Totale renovatie Neumann M269C + custom power supply)
"
Ik ben heel tevreden met het resultaat! Ik wil u nogmaals bedanken voor het fantastische werk dat u geleverd heeft!"

(Restauratie Neumann/ Gefell UM-57)
"
Ben erg tevreden over de microfoon! Klinkt super!"

(Reparatie Neumann KMR82i)
"
Uit mijn eerste en enige test bleek ik een goed werkende microfoon terug te hebben! Dus volgens mij ben ik erg tevreden."

(Reparatie Studio Projects C1)
"De C1 klinkt weer als vanouds! Ik ben zeer tevreden met de snelle en goede service!"

(Reparatie Audix SCX-25)"Bedankt voor jouw reparatie en uitstekende service! Mocht er weer iets zijn met een microfoon weet ik je te vinden!"

Van Steenis Audio
Fenneweg 2
8432PT  Haule
Nederland
KvK 63938472

http://www.vansteenisaudio.nl
info[at]vansteenisaudio.nl

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Microphone repairs and capsule cleaning

We are an official service/repair point for Beesneez microphones.

We are specialized in (studio) condenser microphone repairs.
Also we can modify and improve the electronics in condenser microphones.
We have extensive experience with the following models:

- Neumann U47
- Neumann U67
- Neumann U87
- Neumann U89
- Neumann M49/M50/M147/149
- MCA SP-1
- MXL
- Oktava
- RØDE
- Devine BM-600 / ISK BM-600

etc.

(N.B: We DON'T service dynamic- and ribbon microphones!)


As modifications you can think of: the reduction of self noise, raising the maximum output (maximum SPL), increasing the frequency response (better LF response), better symmetry of output, replacing the FET and changing the capsule.
Modifications can make a relatively inexpensive microphone sound noticeably better.  Many Chinese-made microphones can be significantly improved.

Do you have a Devine BM-600 microphone bought from that nice offer and it appears to be a bit noisy and  sounds a bit 'thin'?
In that case it is good to know that we can upgrade your microphone with better components.
Less noise and a significant better frequency response. By default, a frequency of 20 Hz. is already 5 dB attenuated with respect to the higher frequencies. After modification, the microphone is flat to 20 Hz. and the output is only 1 dB attenuated at 10 Hz! The Price for this modification is 25 Euro.
We also modify the phase of the microphone so that it is in accordance with the European standard.

Over time the capsules in a condenser microphone will pollute.
Problems that then arise include reduced treble and a stronger noise or 'bubbling sound' of the microphone, especially if one closely speaks or sings into the microphone.
The cause of this is surface conduction on the membrane, so that leak currents occur.
Incidental 'ticks' (so called 'popcorn noise') can also be caused by a polluted capsule. In these cases a capsule cleaning should be considered.
The capsule itself is very fragile, the membrane has a thickness of 3-6 microns, while the vapor-deposited gold layer is hardly more than one molecule thick!
Cleaning of the membrane with a cotton swab is almost a guarantee for the destruction of the capsule. In addition, there is a risk that the gold layer by such an operation will be sanded away.

Here is an example of a microphone capsule which is 'cleaned' by an unexperienced person.
Most of the gold on the membrane has disappeared. It is clear to see that the vapor-deposited gold has flaked off and is then literally 'wiped' of the membrane. The only remedy to get the microphone in good shape again was to replace the microphone capsule.
An expensive repair, which could have been avoided. This is the reason why we advise not to clean the membranes in a microphone yourself without proper knowledge, equipment and experience.

This is an example of a very dirty capsule from a Neumann U87 microphone

Very dirty capsule

Very dirty capsule 

Needless to say, that no quality can be expected here.
Typically, the contamination will be less. It is not recommended to wait too long before cleaning the capsule. Except that the quality will gradually decline, it will also be difficult to clean the capsule so that it will be in ‘new’ condition.
This is the difference between a 'normal' polluted capsule before and after cleaning:


Dirty capsule

Before cleaning

Clean capsule

After cleaning; the capsule is like new

After cleaning the microphone will be tested and the screws in the headbasket will be secured. Now the microphone can be sent back to the owner.
The price for cleaning a capsule of studio microphone is 45 Euro (Ex. BTW/VAT and the costs for shipping). Prices for microphone modifications upon request.
Click HERE to contact us.

Microphone modifications:

Many 'historical' tube microphones (Telefunken ELA M251, Neumann M49 etc.) use an AC701 tube. These tubes have not been produced for many years and are therefore becoming very scarce. If they are already available, the quality is often questionable (often coming from rejected batches) or even sometimes 'counterfeit' copies are found that do not meet the original specifications.
When the microphone starts to make a soft 'rustling' sound, it is often a sign that the tube in the microphone is approaching the end of its life.
The solution can be very expensive, because the original AC701 tubes sometimes are sold for prices around $1495!
Fortunately, we can offer an affordable solution in such cases.
After a long search we found a replacement tube for the AC701, which can revive the microphone in its former glory. Often even the microphone's self noise is lower than with the original AC701.
However, a small modification of the microphone and the power supply is required. You will of course receive your original AC701 back, if you want to be able to restore the microphone in its original state when you sell it. For more information about replacing the AC701, please contact us.

Here is an example of a solid-state microphone modification.
We took a cheap MXL 440 microphone. (July 2015 Price: 59, - Euro)

Original MXL440

The microphone, advertised as a ‘large diaphragm microphone' actually contains a small capsule (effective diameter 17 mm.) Surrounded by a brass ring, to make it appear a larger capsule when looking through the headbasket.
The microphone has a moderate front/rear ratio, while the electronics are constructed with simple SMD components. No attention seems to be paid to the matching of components, while the self noise is rather high and there is a DC offset between the audio signal wires.

To begin with, the capsule was replaced by a large membrane SK-12 capsule.
The original printed circuit board was removed and is replaced by a new circuit, built up of selected discrete components.

Modified MXL440

The result is an extremely low-noise microphone with excellent quality, higher signal output, and a very low distortion (about 0.02% at high signal levels), which can measure up with much more expensive microphones! Such modifications can be carried out at various microphones.

Here is another example of a microphone modification:
 

In this case it is a JoeMeek JM27 pencil microphone.

The microphone design is very simple (upper microphone); a single FET with a small 2: 1 transformer. The problem that manifested itself with this microphone was that it could only handle low sound pressure without distortion, while the self noise was quite high.

The polarization voltage on the microphone capsule was low, just over 30 volts.

In this microphone the original circuit board was replaced by a self-designed circuit. Although the space in a pencil microphone is very limited, a DC / DC converter could still be implemented, which ensures a higher polarization voltage.

The microphone now has a higher output than in its original state, while much higher sound pressures can be handled without distortion. Also the self-noise is now minimal. (Lower microphone)

The maximum output voltage at less than 0.1% distortion is 800 mV!
 

If you want to send in a microphone for repair: 

- Ensure good packaging, you do not want any new damage during transport!
- Add a description of the problem, there are so many microphones coming in on a regular basis, that it is impossible to search all previous email correspondence to trace the description of the problem of the microphone in question. Also mention the return address!
- Do not add any accessories such as shock mounts, pop screens, etc.
Send the microphone with as little accessories as possible (but well packaged!)
- If the microphone has its own power supply (ie no standard phantom power), we also need the corresponding power supply and cable, because there is a lot of diversity in microphone cables and power supplies.

 

For more information about microphone repairs, please use the contact form.

©2015-2018 - Van Steenis Audio

 
   ©2015-2018 - Van Steenis Audio