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Hi! I would love to build this, but as I wait for the pcb is available I would like to buy the BOM, maybe watch scheme too

Great preamp distortion I would love to build

I've built this one and works alright except that it squeels a lot even in lower gains. Any tips?

Hi, I was wondering if there is a way to turn on/off the drive to use it as a clean preamp with optional drive. Any suggestions?

Hi! Found this article wich shows hoy to do a "diy" 4301 with the most close replacement for the critical part (4305) 2 opamps and 2 resistors. Also they leave some images of a daughter board to make it tht. I hope it will be useful to someone...

Any bass preamp for djent

Hi, I want to put an eq control for the obsidius, I am thinking in putting it right before de volume stage. Do I must put it before R25 (on diagram) or before IC 4.1?

I biult one and it works great except that when I turn the Highs to minimun it starts sounding like crap, like something is broken. Any toughts?

Hi, I am bulding a muzzle and it seems to work ok with the paralel output mod. The problem is that when the effect is on the volume drops drastically. Also the led seems to change colour but red is always on, it is like change de red to orange. Also the that4301 ic heats a little. I have some...

As I understood the Isosceles have the fortin 33, fortin grind and tc integrated preamp, right? I am wondering where are the 2 1N914 diodes of the 33 on this, or waht function have in the 33 circuit due that the isosceles does not have them. Thougts?

I was wondering if there is any way to add a dedicated tap tempo footswitch for projects that use fv-1 for delays time or modulations/reverb oscillation