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SE 2200a modification of the internal input circuitry
Old 21st January 2019
  #61
Here for the gear
 

Thank you for all this great work, Jean.

I found out one of my sE2200A mics is actually ok. After changing a lot of the wiring in my studio to balanced cables and clean power the hum and noise it had went away, there is just some low background noise from the pre-amp. The second sE2200A is now also ok, but has a much much higher noise-floor. What do you think could be causing this in the stock circuit? I swapped the capsules over on the units and there was no difference, so it must be present in the electronics somewhere...
Old 26th January 2019
  #62
Gear Head
 

May be a lot of things
1) Probleme if the capsule is not used in a dry place (I'm taking about the water in the air)
2) some condenser is dead
3) some jfet or transistor is out of order or malfunction
4) 1 Gohm high value resistor has changed because of water
5) bad soldering

without special mesurings devices, you can only change one element and control if the problem is over or not

If you had some suspicious external wirings, you could have some problems with phantom power (short circuit between mass and hot or return wire)
In this case, have a look first close to the output components

If you have $$, just buy a Rode NT1, it's very good and transformerless circuitry
Old 15th July 2019
  #63
Here for the gear
 

Could anyone re-upload the archive again please?
Old 21st July 2019
  #64
Gear Head
 

Hello, this link, version with transformerless option

https://we.tl/t-LhMg44sP1M
Old 2 weeks ago
  #65
Here for the gear
 

Hi Jean, great work! Hate to be a pest, but that link from July expired. Could you please repost? Many thanks!
Old 2 weeks ago
  #66
Gear Head
 

No problem

available 7 days

https://we.tl/t-fegvC4xNN0
Old 6 days ago
  #67
Here for the gear
 

Thanks Jean, sorry but one more time please? (Somehow I didn't get the alert that you'd replied and it just expired.. argh!!)
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