Joyo (Which have been rebranded Harley Bensonpedals are all the rage around the Boutique scene at the moment. It’s common knowledge that the Freakish Blues Alpha Drive is just a repainted Joyo Ultimate Drive. However, the Ultimate Drive is just a clone of the Fulltone OCD (Which itself is a close copy of the Voodoo Labs Overdrive). It’s a long family tree….
Here’s a demo video of them side by side:
And here’s a nice clip of just the Alpha Drive:
And here’s the schematic:
Now, you could build yourself an OCD clone and have done with it, or you could buy one of these for $35 and save yourself some cash:
If you want to build yourself an OCD clone check out this great project on the blog: http://revolutiondeux.blogspot.com/2008/07/fullclone-vlod-fulltone-ocd-by.html
Here’s a nice post detailing some gain modifications to the Joyo circuit: http://freestompboxes.org/viewtopic.php?f=10&t=15833