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 31 
 on: July 07, 2019, 03:28:50 am 
Started by RuudNL - Last post by RuudNL
Thanks Klaus! That is a great and simple solution.

 32 
 on: July 06, 2019, 05:35:37 pm 
Started by RuudNL - Last post by klaus
You gave the hint for the solution in your last sentence: simply* extract one from a Tuchel broadcast connector, and install it in the mic! The contacts used in U87/U67 head assemblies are actually the same as used in Tuchel-brand broadcast mic cable connector females.

* You need to use a trick to extract the pin from the connector without damaging its anchor: push the little barb/anchor which blocks the pin from coming out of its position inside the plastic connector IN, i.e. towards the center, as you lift it out. Use a very small screwdriver blade to do this:  ≤ 1.2 mm. Once out, reestablish the angle of the barb, so it again will seat properly in the Neumann head without being pulled out when removing the capsule head

 33 
 on: July 06, 2019, 03:24:00 pm 
Started by RuudNL - Last post by RuudNL
I have a Neumann U87 with some damaged contacts in the microphone body.
It seems that someone has removed the capsule assembly and placed it back while the pins of the capsule head were not properly aligned.
So I would like to replace the contacts, but the problem is where to find the correct type.
I know that Neumann used to sell the whole socket assembly, but it goes a bit far to order a complete new one, because only a couple (2 or 3) of the small contacts are damaged.
So: where could I find usable (female) contacts, that would fit the plastic base?
Eventually I could use contacts from a cable connector that would take the same pin size (1.5 mm if I remember correctly). Any help would be highly appreciated!

 34 
 on: July 06, 2019, 02:10:26 pm 
Started by afterlifestudios - Last post by klaus
Some people like their pilot lights bight, others like it barely visible. Install a 2W resistor in series with the bulb feed, after temporarily soldering in a trimmer, to determine your preferred illumination level for the bulb.

 35 
 on: July 06, 2019, 01:29:32 pm 
Started by afterlifestudios - Last post by afterlifestudios
One more question.  What about the heat?  This 110v incandescent bulb gets very hot to the touch...  The lamp holder has a “plastic” (?) screw on cover. I guess I’ll keep a close eye on it today...

 36 
 on: July 05, 2019, 10:54:55 am 
Started by Silvas - Last post by Silvas
Also...There's silicon diode bridges out there that resemble the original in terms of "looks" and terminal positioning ? Don't want to hurt the looks of it ;-)

 37 
 on: July 05, 2019, 10:52:53 am 
Started by Silvas - Last post by Silvas
Thank you guys, will re-check everything including the rectifier under load ! This is very useful info. Appreciate it a lot !

 38 
 on: July 05, 2019, 05:59:03 am 
Started by wdevlieger - Last post by maza
Klaus, a late thank you for an excellent piece of advice!

And thank you Dennis for superb service and great transformer. In case anyone else has a C28C with broken transformer, I am happy to let you know that he definitely can either repair yours or even sell a replacement. Thumbs up, guys, one more mic up and running again!

 39 
 on: July 04, 2019, 04:10:59 pm 
Started by Mark Lemaire - Last post by klaus
The screw in the photo is a circuit mounting screw, not a voltage adjustment screw, The N52t adjusts the heater voltage by paralleling a selectable resistor with R6. Use Ohm's law and the calculation for resistors in parallel to find the correct value.

More importantly, before you do that: You need to have an experienced electronics tech analyze WHY your voltage dropped so much. This could be a failed component in the supply or on the mic amp. The latter is easily tested by connecting the other M269 and its cable to the supply and observing the heater voltage. If it is still low, the supply needs to be analyzed and repaired.

 40 
 on: July 04, 2019, 01:18:54 pm 
Started by Mark Lemaire - Last post by Mark Lemaire
here is the other N52T. No resistor covering the screw head!

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