маркировка микросхемы в DIP-е затёрта. Хорошо, если это какой-то ОУ, а если что-то экзотическое.
Может быть чип на преобразователь поляризующего напряжения капсюля.
тут пишут, что в CMC6 имеется чип компаратора для контроля напряжения с затертой маркировкой:
CMC6 has the ability to automatically accommodate very wide supply phantom voltage, something like from 12-52V due to the usage of active voltage regulator circuit... Technically,
CMC6 and CMC5 should sound identical but they don’t. The reason is that the
active regulator in CMC6 uses a particular comparator IC which I think was a mistake to use in that particular circuit because the comparator part of the circuit is oscillating where it shouldn’t (
Schoeps scratched out the part number on the part so I have no way of finding out what part they used).
I tried different ICs when I discovered that problem and found that the problem could be easily solved and I disclosed my finding to Mr. Wuttek before his retirement from Schoeps in one of our personal meetings and he said he would investigate into it. I never heard back from Mr. Wuttek or Schoeps since that meeting... I didn’t want to spend my time fixing every one of my
CMC6 bodies, and I had a lot of them, so I replaced all of them with CMC5s instead.
https://www.gearslutz.com/board/rem.../789870-schoeps-cmc5-vs-cmc6.html#post8500528
One thing which should be made clear is that the
CMC 6 amplifier is not a "12 to 48 Volt" phantom-powered microphone amplifier; it is, rather, a "12 _or_ 48 Volt" amplifier. The power supply must conform to one or the other standard version of phantom powering.
That's a potentially serious issue. Once I tested a small preamp with a CMC 6 amplifier. The preamp had a poorly designed "48 Volt" supply... The voltage drop across that extra resistance (4 mA x 2.5 kOhms = 10 Volts!) caused the output voltage to fall far enough so that the CMC 6 amplifier switched into its 12 Volt mode, where it draws 10 mA...
https://www.audio-forums.com/thread...y-audible-sound-difference.23736/#post-122434
there have been two versions of the
CMC6, which differ in some details of construction; the more recent version has better defenses built in against RFI. This version can be identified by looking into the XLR connector well -- if you see a gold-colored plate at the far (inside) end of the well, it's the newer version...
the low-cut filters are different: The
CMC5 (default version) has a single-pole filter while the
CMC6 (default version) has a two-pole filter at a somewhat lower frequency.
https://www.gearslutz.com/board/rem...9870-schoeps-cmc5-vs-cmc6-2.html#post10810490