Here's a schematic of Joe's preamp tweaked to my liking. It's the way it is on my breadboard at the moment. To date, I have tried a few different combinations and this is one of my favorites.
Here's the original design
https://www.diystompboxes.com/analogalchemy/sch/v4preamp.html
As you can see, aside from different transistors and their collector resistors, I ditched two emitter bypass caps (3rd and 4th stages) and changed the values of the other two (1st and 2nd stages). I added bright caps here and there and changed tone stack capacitors. Also the TS potentiometers are higher value because these are the only ones I have. Oh, and my mid pot is 50k.
Many thanks to Joe Davisson for sharing his idea with the interwebs.
M.
Here's the original design
https://www.diystompboxes.com/analogalchemy/sch/v4preamp.html
As you can see, aside from different transistors and their collector resistors, I ditched two emitter bypass caps (3rd and 4th stages) and changed the values of the other two (1st and 2nd stages). I added bright caps here and there and changed tone stack capacitors. Also the TS potentiometers are higher value because these are the only ones I have. Oh, and my mid pot is 50k.
Many thanks to Joe Davisson for sharing his idea with the interwebs.
M.