This PCB can be used to build a SLO clone by using a single platform.
 
By purchasing this board, you get access to full schematics and layouts tailored for my boards. I've documented the SLO amp model with schematics, layouts and BOM - including both the LDRs and the relays switching option.
 
Dimensions: 400mm x 78mm
 
NOTE: Depending on the batch, color of the PCB could be either gloss black or forest green. The two versions are sonically equivalent.