As there is a bit of discussion on mods to the 1200 type mic in the "for sale" section, i thought i would put up the list of mods being made available to those involved in this GB.
http://recforums.prosoundweb.com/index. ... msg_385360
*Model T14-1200 ($75) Exact drop in replacement for stock ACM-1200. No electronics modifications necessary.
*Model T14-C12 ($75) Replacement transformer for ACM-1200, but can only be coupled with the custom C12-based electronics PC board upgrade (now in design by Lucas techs, but based on Oliver's original design parameters for the C12VR upgrade electronics).
(The T14-1200 transformers are based on the Hiller T14-C12 transformer (ratio 12 to 1), as used in early C12 mics, but have the ratio of 9 to 1 as used in the stock ACM-1200.)
*Model T47 ($85) Replacement transformer for ACM-1200 with U47-like transformer characteristics (BV8), but can only be coupled with the custom "47" electronics PC board upgrade (now in design by Lucas techs, and based on a simplified 47-inspired electronics circuit).
*Model T49 ($85) Replacement transformer for ACM-1200 with UM49-like transformer characteristics, but can only be coupled with the custom "49" electronics PC board upgrade (now in design by Lucas techs, based on a simplified 49-inspired electronics circuit).
*Model T67 ($90) Replacement transformer for ACM-1200 with U67-like transformer characteristics, but can only be coupled with the custom "67" electronics PC board upgrade (now in design by Lucas techs, based on a simplified 67-inspired electronics circuit).
(The 47-49-67 transformers are based on a Neumann-inspired transformer. They come in the three different ratios of 6:1 for 47-styled electronics, 10:1 for 49-styled electronics, and 7:1 / with feedback winding for 67-styled electronics.)
Chris Hallam.
https://soundcloud.com/hallamsound
Whatever floats your boat.