micaddict,
I just meant that the AMI T14 was a smaller form factor, not that it was dimensionally the exact same as Haufe.
Here's a quote from Klaus:
"From my upcoming book "The Vintage Microphone Handbook":
"Three distinct generations of C12 can be identified, primarily by their visibly differing output transformers. The first one, from 1953 to about 1955, used the Hiller-made T14. A beefy looking affair, which, as mounted on the mic’s frame, barely clears the housing tube.
The next generation C12, including most ‘Siemens SM 204/23’-branded models, used the Henry Radio, model 2148, identified by that number on one side, and a black diamond painted on the opposite side onto lacquer-soaked brown cloth wrapping. These transformers can be found as early as 1954. Around 1958 the mic received its final transformer, the rather anemic looking T14/1, made by Haufe, near Frankfurt, Germany- the only transformer company that has been continuously supplying German mic manufacturers since post-war years through today. The last transformer version, by the way, was also used in AKG’s C24, ELA M 250/251, and C28A mic models." © Klaus Heyne, 2013 "