Another one from RFNR, a buffer/booster/light overdrive.
Schematic and descriptionVerified vero
It is a warm sounding booster or light overdrive depending on your setup.
I used 2N5457 for Q1 and Q4 but any J Fet will probably do. For the BJT's I used 2N5088 for Q2 and 2N5087 for Q3. I also swapped the gain pot for a reverse log taper since the action started at the very end of the sweep