MK-1 Preamp (1C-MOD)

This is an interesting  MOD that can  be performed by just replacing ONLY 1 SMD capacitor located on the Treble filter branch  of the MK-1 Equalizer section. (1C => replace  1 capacitor)

For more details of the MK-1 Preamp please have a look at the previous posts in this blog.

Here in the pic the details of the proposed optimization:

WARNING :

SMD USED ARE 0805  size, VERY SMALL .. then GOOD SOLDERING SKILLS ARE REQUIRED  to perform the job!!!    With some extra attention ALSO A 1206 smd can be used.

The effect of this fix is to MOVE the bell curve of the Treble filter AWAY  from the Bass  curve avoiding to share too much interaction of the respective controls and .... at  the same time calm DOWN just a little the excessive PREDOMINANCE of the Treble itself.

The new curve is then shaped like this:

Let's now see if a bit of clockwise roll of both  Bass & Treble controls will generate the flat PIZZA described in the previous post ( https://corta4reloaded.blogspot.com/2020/04/mk-1-preamp-anatomy-equalizer.html ) or not:

No more flat PIZZA .... We start to to see some personality rising !!!!

We can see the overall new performances here, please note the cross area is at 400Hz:

For a quick comparison here the pic of the original MK-1 preamp 
response curve with the crossing area centered at 250Hz:

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