Thanks Phil...

as soon as possible i will try the phabbtone and DDC.

the circuit i posted was an idea close to some circuit i found
on the web that gives the curve of a treble booster.

http://www.elecfree.com/circuit/tone-control/treble-booster-by-741/
(but i used it accidentally after the distortion and sounded good)

i found it very useful together with a traditional baxandall to get
marshall 4x12 when using HEADPHONES...
as you mentioned it has a fall after 4Khz... and the curve grows evenly till
it gets the peak on 4khz.

I mixed ac/dc music on headphone to ensure that my ears could not lie to me....

Considering the huge amount of diferent conditions that my humble room/laboratory
is from ANGUS stage, i found it very useful....

The hard stuff is to get the sound when the volume is not
very much high (i don´t know how to say).
the kind of compression that makes tube amps very famous..
When touch hard the string and the notes sounds like screaming...
very famous at blues genre... sounds very natural...
maybe because of compression caused by interraction between
phase splitter and output tubes...

I was not aware of the fact that you said about cranking marshalls and tone controls...

I am actually finding digital software with graphic equalizer very useful to help to understand what we need... One good example is Cool Edit (just to mention one)...

thanks again. hope some body enjoy your ideas too...

First i wanna thank you for your capacity to share that kind of knowledge.
I MUST SAY that is incredibly rare and precious...

i have been reading and researching those kind of stuff for years (i mean
- ideas about tube amps made with SS)...
but it´s very sad that we cannot find very much ideas to apply..
when the thing is good it is always protected..

I personally agree that tone shaping (equalization) can make the sound you want..
but sounds to me that a good circuit for tone shapping
in general gets very expensive...
in many ways it is very hard to me to get the sound of tubes in my country.
the problem is entirely mine, but i like the distortion produced
by tube amps...

below is one idea for tone of 4x12 box that i found the other day...



It gets one peak arounf 4Khz... very good for ac/dc....
baxandal controls are used after this thing...
your distortion circuit sounds very good (the most natural distortion-
better than DS1 aproach and many others)...
I hate ts9 aproach for distortion..
If we look at Stephan moeller work (not very easy to find today- he
simulated vox ac-30 from op amps and diodes) he advices us to use
op amp at inverter configuration...

i am trying to get AC/DC perfect emulation (sorry if some hate this word)
from op amps (and whatever is possible - since it is SS)...

thanks again hope you be happy with your research.