Schoeps CMN 51 Powersupply

[geebeeVIE]

Hi All,

I have been offered a Schoeps CMV51/9 with CM51/U capsule.

Unfortunately there are neither Powersupply or Cable included, but the price seems good and cosmetically the mic looks good.

On the web there is very little information to be found.

I think it uses a 6AU6 Tube, so it would need 6,3V heater and some 120-145V (?) Plate Voltage.

Any ideas for a power supply circuit? Could any of the "standard powersupplies" that are available on the forum be used?

 

[ln76d]

Look for Telefunken schematics.
If there wasn't exact model with tele logo you will find something similar.
From what i remember most 6au6 schoeps used negative voltage.
Here's some handrawed schematic from the net.
https://www.flickr.com/photos/audiotesla/8589355756
If you will look for schoeps/telefunken/siemens schematics with 6au6 you will find many similarities.

 

[panman]

These might help:
http://www.xaudia.com/xaudia/Schematics/Pages/Schoeps.html#0
Schoeps N60B fits for that one, I do not know if CM51 is any similar.
I also have the schematics, but cannot convert it right now to fit here.

 

[ln76d]

If we are on Stewart page, here's another example:
http://www.xaudia.com/xaudia/Schematics/Pages/ELAM_files/Media/ElaM_200_201/ElaM_200_201.jpg?disposition=download
http://www.xaudia.com/xaudia/Schematics/Pages/ELAM_files/Media/ElaM_PSUi/ElaM_PSUi.jpg?disposition=download

 

[panman]

This should work now:

https://www.dropbox.com/s/7rrbie9xowwwycl/SchoepsN60B.bmp?dl=0

 

[panman]

I finally was able to compare the hand-drawn schematics with the CV60 schema. They are the same except the carbon pieces. I was not able to read or understand the text(Dutch?) though. CV60 was mentioned there too. The PSU schema has an obvious mistake: C1,C2,C3 are polarity reversed.  By the way, what is the reason for using negative voltage? Would it not work as well with positive?