Little Jim - a Marshall inspired MOSFET distortion pedal design

[temol]

Please post link to the AMT Soldano schematic.

Thanks

https://tinyurl.com/yutwzm8x
transistors:  2SK208-R

[rutgerv]

Better have a look at this link https://guitar-gear.ru/forum/index.php?app=core&module=attach&section=attach&attach_id=39108

The S2 is the Soldano and slightly updated version of what was posted earlier. jFETs are indeed 2SK208-R.

[rutgerv]

I believe it is mainly the J177 paired with the SK208R (OR equivalent 2sk30) that allows to achieve a more specific type of asymmetry in the saturation curve.

[Vivek]

Thank you Temol and Rutgerv !

I am on a quest to analyse as many AIAB as possible.


Phew this schematic is big, it might take me a week to enter into spice.


One thing we discovered on an earlier thread,

If later stages are too hard symmetrical clipping, they wipe out all effects of earlier asymmetric clipping.

[rutgerv]

Don't bother putting everything into Spice, the first page contains the buffering, switching and clean amp that is the same throughout the whole Legend series. The part that counts for Tone is the S2 section of the schematic. I've also been able to reverse engineer the Vt2 from the same series and while very close to the S2 it has a bit more body in the mid range. Also here the lack of noise at high gain is impressive.