that looks like a Dr . boogie to me re branded by some DIYer.
It is a circuit originally designed by the guys at runoffgroove who licensed it to OLC circuits. As we all know Mesa is patent happy and OLC changed the name of the pedal to reflect the SLO 100.
The Dual rectifier preamp is EXTREMELY similar to the SLO 100, and remember a pedal has no rectifier tubes at all.
The pedal is basically a solid state preamp that is a clone of the DR circuit which is a clone of the SLO 100.
The pedals use JFET transistors in place of tubes.
SO, Id say before i spent 150 bux to buy one from a random DIYer you should get from the guys who are selling it legally, OR get their KIT version for half as much and build it yourself.
don't be intimidated, I assure you with some patience and a soldering iron you could build it.
OLC circuits here: the slow century is the model.
http://olcircuits.com/index.html