MK-1 Preamp Anatomy (EQUALIZER SPECIFICATIONS)

Now that We have completely dissected and reverse engineered  the whole  little thing.......
I need to be sure about the Factory specs of the equalizer and plot some graphs that We will use as STARTING POINT for any future optimization.

There is and old graphic  I found over the Internet (unknown surce) displaying the overall equalizer "factory" curves of the MK-1:

We need to find OUT the naked truth.... so let's model the 2 Equalizer sections using a Circuit Simulator (Multisim in  this occasion) :

Performances  of the BASS - TREBLE  1st Equalization stage model:

The bass & treble filters branches are using & sharing the 2nd half of IC2 Operational Amplifier.

• BASS BRANCH SECTION

• TREBLE BRANCH SECTION

Performances  of the single separated MID  2nd Equalization stage (IC3):

The MID RANGE  filter , centered on 355 Hz  is using the 1st half of IC3 Operational Amplifier.

.....  now let's put ALL THE THINGS TOGETHER :-)

OK.....
This will be Our starting point. In fact...If  We make a comparison with the specs declared by the Factory.... We have a quite good MATCH and this shows the foundation  of  the reverse engineering  !

:-)


In the next posts We will review  the practical usability and performances of the MK-1 defining paths for implementing some definitive enhancements of it.


Stay tuned!





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