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[Mannix]

I’m confused as to whether or not the original AKG C12 ever came with the large Rohde and Schwarz T-14, v2545 transformer. I understand R&S could have been supplied to other companies to be fit into the C12.

I have seen a photo recently of an original c12 with what is a purported Rohde & Shwarz v2545 T-14 transfomer with the logo blacked out. The owner says ‘AKG blacked out the logos.’  Could this be original to the mic?
Only speculation, but I think if it were a replacement, why would anyone bother to black out the R&S logo?

Wish I could post photos, but the owner does not want them posted. It is printed 2545 on one side, and bears a black diamond shape (again, purportedly the blacked-out logo) on the other side.

[Kai]

Looking at various photos of C12 internals in the net, I did not see any company logos on the transformer.

Maybe you do the same - as you can‘t share the photos of the specimen in question, you’re in a better position to do so.

[Mannix]

These photos are not of the mic I am inquiring about.

I have a file of C12 photos for study and looked through them. I found one bearing a blacked-out diamond shaped logo, but on the verso bearing different numbers than 2545.

I also found what I assume to be a diamond-shaped Haufe(?) logo.

What I forgot to add to my original query was that the owner of the mic in question states that his is a very early C12.

[Mannix]

2nd photo

[klaus]

The story is complicated and all the answers are not in yet.

What I know: The very first  C2, which morphed into the C12 by 1953, had a Hiller-supplied T14. But that may be vaporware: no one has ever seen a mic with that transformer, as the production version received the Henry 2148 by late 1953 (it can be identified with a diagram of the impedance options printed on the backside of the transformer body.)

But then the plot thickens: I have seen several Siemens-versions of the C12 (SM204/23) from the mid 1950s with the blacked-out diamond transformer. I dissolved the black paint with alcohol, but it did not clarify (see Henry's logo below). So my speculation: Siemens, which, like R&S was headquartered in Munich at the time, may have commissioned the transformer for their C12 version, with similar form factor and likely identical electric properties as the Henry version.

I have asked Carloff to chime in. He has a deep understanding of this matter.

[Mannix]

Something else I forgot to mention; the mic in question is indeed Siemens branded.